| Directory: | ./ |
|---|---|
| File: | plugin/group_replication/libmysqlgcs/src/bindings/xcom/xcom/xcom_base.cc |
| Date: | 2022-12-06 21:40:42 |
| Exec | Total | Coverage | |
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| Lines: | 2771 | 3495 | 79.3% |
| Branches: | 1937 | 3808 | 50.9% |
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| 1 | /* Copyright (c) 2012, 2022, Oracle and/or its affiliates. | ||
| 2 | |||
| 3 | This program is free software; you can redistribute it and/or modify | ||
| 4 | it under the terms of the GNU General Public License, version 2.0, | ||
| 5 | as published by the Free Software Foundation. | ||
| 6 | |||
| 7 | This program is also distributed with certain software (including | ||
| 8 | but not limited to OpenSSL) that is licensed under separate terms, | ||
| 9 | as designated in a particular file or component or in included license | ||
| 10 | documentation. The authors of MySQL hereby grant you an additional | ||
| 11 | permission to link the program and your derivative works with the | ||
| 12 | separately licensed software that they have included with MySQL. | ||
| 13 | |||
| 14 | This program is distributed in the hope that it will be useful, | ||
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| 17 | GNU General Public License, version 2.0, for more details. | ||
| 18 | |||
| 19 | You should have received a copy of the GNU General Public License | ||
| 20 | along with this program; if not, write to the Free Software | ||
| 21 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ | ||
| 22 | |||
| 23 | #include <assert.h> | ||
| 24 | #include <errno.h> | ||
| 25 | #ifndef __STDC_FORMAT_MACROS | ||
| 26 | #define __STDC_FORMAT_MACROS | ||
| 27 | #endif | ||
| 28 | #ifndef _WIN32 | ||
| 29 | #include <inttypes.h> | ||
| 30 | #endif | ||
| 31 | #include <limits.h> | ||
| 32 | #include <signal.h> | ||
| 33 | #include <stdio.h> | ||
| 34 | #include <stdlib.h> | ||
| 35 | #include <string.h> | ||
| 36 | #include <sys/time.h> | ||
| 37 | #include <sys/types.h> | ||
| 38 | #ifdef _MSC_VER | ||
| 39 | #include <stdint.h> | ||
| 40 | #endif | ||
| 41 | |||
| 42 | #ifndef _WIN32 | ||
| 43 | #include <poll.h> | ||
| 44 | #endif | ||
| 45 | |||
| 46 | /** | ||
| 47 | @file | ||
| 48 | xcom/xcom_base.c | ||
| 49 | The new version of xcom is a major rewrite to allow | ||
| 50 | transmission of multiple messages from several sources | ||
| 51 | simultaneously without collision. The interface to xcom is largely | ||
| 52 | intact, one notable change is that xcom will consider the message | ||
| 53 | delivered as soon as it has got a majority. Consequently, the VP | ||
| 54 | set will not necessarily show all nodes which will actually | ||
| 55 | receive the message. | ||
| 56 | |||
| 57 | OHKFIX Add wait for complete last known node set to mimic the old | ||
| 58 | semantics. | ||
| 59 | |||
| 60 | |||
| 61 | IMPORTANT: What xcom does and what it does not do: | ||
| 62 | |||
| 63 | xcom messages are received in the same order on all nodes. | ||
| 64 | |||
| 65 | xcom guarantees that if a message is delivered to one node, it will | ||
| 66 | eventually be seen on all other nodes as well. | ||
| 67 | |||
| 68 | xcom messages are available to a crashed node when it comes up | ||
| 69 | again if at least one node which knows the value of the message | ||
| 70 | has not crashed. The size of the message cache is configurable. | ||
| 71 | |||
| 72 | OHKFIX Add logging to disk to make messages durable across system | ||
| 73 | crash and to increase the number of messages which may be cached. | ||
| 74 | |||
| 75 | There is no guarantee whatsoever about the order of messages from | ||
| 76 | different nodes, not even the order of multiple messages from the | ||
| 77 | same node. It is up to the client to impose such an order by | ||
| 78 | waiting on a message before it sends the next. | ||
| 79 | |||
| 80 | xcom can notify the client that a message has timed out, and in | ||
| 81 | that case will try to cancel the message, but it cannot guarantee | ||
| 82 | that a message which has timed out will not be delivered. | ||
| 83 | |||
| 84 | xcom attaches a node set to each message as it is delivered to the | ||
| 85 | client. This node set reflects the current node set that xcom | ||
| 86 | believes is active, it does not mean that the message has been | ||
| 87 | delivered yet to all nodes in the set. Neither does it mean that | ||
| 88 | the message has not been delivered to the nodes not in the set. | ||
| 89 | |||
| 90 | A cache of Paxos state machines is central to the new design. The | ||
| 91 | purpose of the cache is both to store a window of messages, and to | ||
| 92 | decouple the different parts of xcom, like message proposal, | ||
| 93 | message delivery and execution, and recovery. The old cache was | ||
| 94 | limited to caching messages, and a single state machine ran the | ||
| 95 | combined VP and Paxos algorithm. This constrained xcom to deliver | ||
| 96 | only a single message at a time. | ||
| 97 | |||
| 98 | Each instance of the Paxos state machine implements the basic | ||
| 99 | Paxos protocol. Unlike the cache in the old system, it is not | ||
| 100 | cleared when a site is deleted. This removes some problems | ||
| 101 | related to message delivery during site deletion. The cache is a | ||
| 102 | classic fixed size LRU with a hash index. | ||
| 103 | |||
| 104 | Some extensions to the basic Paxos algorithm has been implemented: | ||
| 105 | |||
| 106 | A node has ownership to all synodes with its own node number. Only | ||
| 107 | a node with node number N can propose a value for synode {X N}, | ||
| 108 | where X is the sequence number, and N is the node number. Other | ||
| 109 | nodes can only propose the special value no_op for synode {X N}. | ||
| 110 | The reason for this is to retain the leaderless Paxos algorithm, | ||
| 111 | but to avoid collisions between nodes which are competing for the | ||
| 112 | same synode number. With this scheme, each node has its own unique | ||
| 113 | number series during normal operation. The scheme has the | ||
| 114 | following implications: | ||
| 115 | |||
| 116 | 1. If a node N has not already proposed a value for the synode {X N}, | ||
| 117 | it may at any time send a LEARN message to the other nodes with | ||
| 118 | the reserved value no_op, without going through phase 1 and 2 of | ||
| 119 | Paxos. This is because the other nodes are constrained to propose | ||
| 120 | no_op for this synode, so the final outcome will always be no_op. | ||
| 121 | To avoid unnecessary message transmission, a node will try to | ||
| 122 | broadcast the no_op LEARN messages by piggybacking the information | ||
| 123 | on the messages of the basic Paxos protocol. | ||
| 124 | |||
| 125 | 2. Other nodes which want to find the value of synode {X N} may do | ||
| 126 | so by trying to get the value no_op accepted by following the | ||
| 127 | basic Paxos algorithm. The result will be the actual value | ||
| 128 | proposed by node N if it has done so, otherwise no_op. This will | ||
| 129 | typically only be necessary when a node is down, and the other | ||
| 130 | nodes need to find the values from the missing node in order to be | ||
| 131 | able to continue execution. | ||
| 132 | |||
| 133 | Messages are delivered in order to the client, and the order is | ||
| 134 | determined by the sequence number and the node number, with the | ||
| 135 | sequence number as the most significant part. | ||
| 136 | |||
| 137 | The xcom network interface has been redesigned and is now | ||
| 138 | implemented directly on top of TCP, and has so far been completely | ||
| 139 | trouble free. We use poll() or select() to implement non-blocking | ||
| 140 | send and receive, but libev could equally well have been used. | ||
| 141 | |||
| 142 | Multicast is implemented on top of unicast as before, but the | ||
| 143 | implementation is prepared to use real multicast with relatively | ||
| 144 | minor changes. | ||
| 145 | |||
| 146 | The roles of proposer, acceptor/learner, and executor are now | ||
| 147 | directly mapped to unique task types which interact with the Paxos | ||
| 148 | state machines, whereas the previous implementation folded all the | ||
| 149 | roles into a single event driven state machine. | ||
| 150 | |||
| 151 | The following terminology will be used: | ||
| 152 | |||
| 153 | A node is an instance of the xcom thread. There is only one instance | ||
| 154 | of the xcom thread in the agent. | ||
| 155 | A client is the application which is using xcom to send messages. | ||
| 156 | A thread is a real OS thread. | ||
| 157 | A task is a logical process. It is implemented by coroutines and | ||
| 158 | an explicit stack. | ||
| 159 | |||
| 160 | The implementation of tasks and non-blocking socket operations is | ||
| 161 | isolated in task.h and task.c. | ||
| 162 | |||
| 163 | A node will open a tcp connection to each of the other nodes. This | ||
| 164 | connection is used for all communication initiated by the node, | ||
| 165 | and replies to messages will arrive on the connection on which it | ||
| 166 | was sent. | ||
| 167 | |||
| 168 | static int tcp_server(task_arg); | ||
| 169 | |||
| 170 | The tcp_server listens on the xcom port and starts an | ||
| 171 | acceptor_learner_task whenever a new connection is detected. | ||
| 172 | |||
| 173 | static int tcp_reaper_task(task_arg); | ||
| 174 | |||
| 175 | Closes tcp connection which have been unused for too long. | ||
| 176 | |||
| 177 | static int sender_task(task_arg); | ||
| 178 | |||
| 179 | The sender_task waits for tcp messages on its input queue and | ||
| 180 | sends it on the tcp socket. If the socket is closed for any | ||
| 181 | reason, the sender_task will reconnect the socket. There is one | ||
| 182 | sender_task for each socket. The sender task exists mainly to | ||
| 183 | simplify the logic in the other tasks, but it could have been | ||
| 184 | replaced with a coroutine which handles the connection logic after | ||
| 185 | having reserved the socket for its client task. | ||
| 186 | |||
| 187 | static int generator_task(task_arg); | ||
| 188 | |||
| 189 | The generator_task reads messages from the client queue and moves | ||
| 190 | them into the input queue of the proposer_task. | ||
| 191 | |||
| 192 | OHKFIX Use a tcp socket instead of the client queue. We can then | ||
| 193 | remove the generator_task and let the acceptor_learner_task do the | ||
| 194 | dispatching. | ||
| 195 | |||
| 196 | static int proposer_task(task_arg); | ||
| 197 | |||
| 198 | Assign a message number to an outgoing message and try to get it | ||
| 199 | accepted. There may be several proposer tasks on each node | ||
| 200 | working in parallel. If there are multiple proposer tasks, xcom can | ||
| 201 | not guarantee that the messages will be sent in the same order as | ||
| 202 | received from the client. | ||
| 203 | |||
| 204 | static int acceptor_learner_task(task_arg); | ||
| 205 | |||
| 206 | This is the server part of the xcom thread. There is one | ||
| 207 | acceptor_learner_task for each node in the system. The acceptor | ||
| 208 | learner_task reads messages from the socket, finds the correct | ||
| 209 | Paxos state machine, and dispatches to the correct message handler | ||
| 210 | with the state machine and message as arguments. | ||
| 211 | |||
| 212 | static int reply_handler_task(task_arg); | ||
| 213 | |||
| 214 | The reply_handler_task does the same job as the | ||
| 215 | acceptor_learner_task, but listens on the socket which the node | ||
| 216 | uses to send messages, so it will handle only replies on that | ||
| 217 | socket. | ||
| 218 | |||
| 219 | static int executor_task(task_arg); | ||
| 220 | |||
| 221 | The ececutor_task waits for a Paxos message to be accpeted. When | ||
| 222 | the message is accepted, it is delivered to the client, | ||
| 223 | unless it is a no-op. In either case, the executor_task steps to | ||
| 224 | the next message and repeats the wait. If it times out waiting for | ||
| 225 | a message, it will try to get a no-op accepted. | ||
| 226 | |||
| 227 | static int alive_task(task_arg); | ||
| 228 | |||
| 229 | Sends i-am-alive to other nodes if there has been no normal traffic | ||
| 230 | for a while. It also pings nodes which seem to be inactive. | ||
| 231 | |||
| 232 | static int detector_task(task_arg); | ||
| 233 | |||
| 234 | The detector_task periodically scans the set of connections from | ||
| 235 | other nodes and sees if there has been any activity. If there has | ||
| 236 | been no activity for some time, it will assume that the node is | ||
| 237 | dead, and send a view message to the client. | ||
| 238 | |||
| 239 | |||
| 240 | Reconfiguration: | ||
| 241 | |||
| 242 | The xcom reconfiguration process is essentially the one described in | ||
| 243 | "Reconfiguring a State Machine" by Lamport et al. as the R-alpha | ||
| 244 | algorithm. | ||
| 245 | We execute the reconfiguration command immediately, but the config is | ||
| 246 | only valid after a delay of alpha messages. | ||
| 247 | The parameter alpha is the same as | ||
| 248 | EVENT_HORIZON in this implementation. :/static.*too_far | ||
| 249 | All tcp messages from beyond the event horizon will be ignored. | ||
| 250 | |||
| 251 | */ | ||
| 252 | #include "xcom/xcom_profile.h" | ||
| 253 | |||
| 254 | #ifndef XCOM_STANDALONE | ||
| 255 | #include "my_compiler.h" | ||
| 256 | #endif | ||
| 257 | #include "xcom/x_platform.h" | ||
| 258 | |||
| 259 | #ifndef _WIN32 | ||
| 260 | #include <arpa/inet.h> | ||
| 261 | #include <net/if.h> | ||
| 262 | #include <sys/ioctl.h> | ||
| 263 | #include <sys/socket.h> | ||
| 264 | #ifndef __linux__ | ||
| 265 | #include <sys/sockio.h> | ||
| 266 | #endif | ||
| 267 | #endif | ||
| 268 | |||
| 269 | #if defined(_WIN32) | ||
| 270 | #include <windows.h> | ||
| 271 | #endif | ||
| 272 | |||
| 273 | #include <memory> | ||
| 274 | |||
| 275 | #include "xcom/app_data.h" | ||
| 276 | #include "xcom/get_synode_app_data.h" | ||
| 277 | #include "xcom/node_no.h" | ||
| 278 | #include "xcom/server_struct.h" | ||
| 279 | #include "xcom/simset.h" | ||
| 280 | #include "xcom/site_struct.h" | ||
| 281 | #include "xcom/task.h" | ||
| 282 | #include "xcom/task_net.h" | ||
| 283 | #include "xcom/task_os.h" | ||
| 284 | #include "xcom/xcom_base.h" | ||
| 285 | #include "xcom/xcom_common.h" | ||
| 286 | #include "xcom/xcom_detector.h" | ||
| 287 | #include "xcom/xcom_transport.h" | ||
| 288 | #include "xcom/xdr_utils.h" | ||
| 289 | #include "xdr_gen/xcom_vp.h" | ||
| 290 | |||
| 291 | #include "xcom/bitset.h" | ||
| 292 | #include "xcom/leader_info_data.h" | ||
| 293 | #include "xcom/node_list.h" | ||
| 294 | #include "xcom/node_set.h" | ||
| 295 | #include "xcom/pax_msg.h" | ||
| 296 | #include "xcom/site_def.h" | ||
| 297 | #include "xcom/sock_probe.h" | ||
| 298 | #include "xcom/synode_no.h" | ||
| 299 | #include "xcom/task_debug.h" | ||
| 300 | #include "xcom/task_net.h" | ||
| 301 | #include "xcom/xcom_cache.h" | ||
| 302 | #include "xcom/xcom_cfg.h" | ||
| 303 | #include "xcom/xcom_interface.h" | ||
| 304 | #include "xcom/xcom_memory.h" | ||
| 305 | #include "xcom/xcom_msg_queue.h" | ||
| 306 | #include "xcom/xcom_recover.h" | ||
| 307 | #include "xcom/xcom_statistics.h" | ||
| 308 | #include "xcom/xcom_vp_str.h" | ||
| 309 | |||
| 310 | #include "xcom/network/xcom_network_provider.h" | ||
| 311 | |||
| 312 | #ifndef XCOM_WITHOUT_OPENSSL | ||
| 313 | #ifdef _WIN32 | ||
| 314 | /* In OpenSSL before 1.1.0, we need this first. */ | ||
| 315 | #include <winsock2.h> | ||
| 316 | #endif /* _WIN32 */ | ||
| 317 | |||
| 318 | #include <openssl/ssl.h> | ||
| 319 | |||
| 320 | #endif | ||
| 321 | |||
| 322 | #include <queue> | ||
| 323 | #include <tuple> | ||
| 324 | |||
| 325 | /* Defines and constants */ | ||
| 326 | |||
| 327 | #define SYS_STRERROR_SIZE 512 | ||
| 328 | |||
| 329 | /* Avoid printing the warning of protocol version mismatch too often */ | ||
| 330 | #define PROTOVERSION_WARNING_TIMEOUT 600.0 /** Every 10 minutes */ | ||
| 331 | static double protoversion_warning_time = | ||
| 332 | 0.0; /** Timestamp of previous protoversion warning */ | ||
| 333 | |||
| 334 | /* Skip prepare for first ballot */ | ||
| 335 | #ifdef ALWAYS_THREEPHASE | ||
| 336 | int const threephase = 1; | ||
| 337 | #else | ||
| 338 | int const threephase = 0; | ||
| 339 | #endif | ||
| 340 | |||
| 341 | #include "xcom/retry.h" | ||
| 342 | |||
| 343 | #ifdef NODE_0_IS_ARBITRATOR | ||
| 344 | int ARBITRATOR_HACK = 1; | ||
| 345 | #else | ||
| 346 | int ARBITRATOR_HACK = 0; | ||
| 347 | #endif | ||
| 348 | |||
| 349 | static int const no_duplicate_payload = 1; | ||
| 350 | |||
| 351 | /* Use buffered read when reading messages from the network */ | ||
| 352 | static int use_buffered_read = 1; | ||
| 353 | |||
| 354 | /* Used to handle OOM errors */ | ||
| 355 | int oom_abort = 0; | ||
| 356 | |||
| 357 | /* Forward declarations */ | ||
| 358 | long xcom_unique_long(void); | ||
| 359 | static int64_t socket_write( | ||
| 360 | connection_descriptor *wfd, void *_buf, uint32_t n, | ||
| 361 | connnection_write_method write_function = con_write); | ||
| 362 | |||
| 363 | static double wakeup_delay(double old); | ||
| 364 | static void note_snapshot(node_no node); | ||
| 365 | |||
| 366 | /* Task types */ | ||
| 367 | static int proposer_task(task_arg arg); | ||
| 368 | static int executor_task(task_arg arg); | ||
| 369 | static int sweeper_task(task_arg arg); | ||
| 370 | extern int alive_task(task_arg arg); | ||
| 371 | extern int cache_manager_task(task_arg arg); | ||
| 372 | extern int detector_task(task_arg arg); | ||
| 373 | |||
| 374 | static int finished(pax_machine *p); | ||
| 375 | static int accepted(pax_machine *p); | ||
| 376 | static int started(pax_machine *p); | ||
| 377 | static synode_no first_free_synode_local(synode_no msgno); | ||
| 378 | static void free_forced_config_site_def(); | ||
| 379 | static void activate_sweeper(); | ||
| 380 | static void force_pax_machine(pax_machine *p, int enforcer); | ||
| 381 | static void propose_noop_2p(synode_no find, pax_machine *p); | ||
| 382 | static void handle_need_snapshot(linkage *reply_queue, pax_msg *pm); | ||
| 383 | static void handle_skip(site_def const *site, pax_machine *p, pax_msg *m); | ||
| 384 | static void paxos_fsm(pax_machine *paxos, site_def const *site, | ||
| 385 | paxos_event event, pax_msg *mess); | ||
| 386 | static inline bool is_leader(site_def *site); | ||
| 387 | int is_active_leader(node_no x, site_def *site); | ||
| 388 | static msg_handler *primary_dispatch_table(); | ||
| 389 | static msg_handler *secondary_dispatch_table(); | ||
| 390 | static void recompute_node_sets(site_def const *old_site, site_def *new_site); | ||
| 391 | void recompute_timestamps(detector_state const old_timestamp, | ||
| 392 | node_list const *old_nodes, | ||
| 393 | detector_state new_timestamp, | ||
| 394 | node_list const *new_nodes); | ||
| 395 | void analyze_leaders(site_def *site); | ||
| 396 | static inline int ignore_message(synode_no x, site_def *site, char const *dbg); | ||
| 397 | |||
| 398 | /* Global variables */ | ||
| 399 | |||
| 400 | int xcom_shutdown = 0; /* Xcom_Shutdown flag */ | ||
| 401 | synode_no executed_msg; /* The message we are waiting to execute */ | ||
| 402 | synode_no max_synode; /* Max message number seen so far */ | ||
| 403 | task_env *boot = nullptr; | ||
| 404 | task_env *detector = nullptr; | ||
| 405 | task_env *killer = nullptr; | ||
| 406 | task_env *net_boot = nullptr; | ||
| 407 | task_env *net_recover = nullptr; | ||
| 408 | void *xcom_thread_input = nullptr; | ||
| 409 | |||
| 410 | long xcom_debug_mask = | ||
| 411 | /* D_DETECT | */ D_FSM /* | D_FILEOP | D_CONS | D_BASE */ | D_TRANSPORT; | ||
| 412 | long xcom_dbg_stack[DBG_STACK_SIZE]; | ||
| 413 | int xcom_dbg_stack_top = 0; | ||
| 414 | |||
| 415 | static void init_proposers(); | ||
| 416 | void initialize_lsn(uint64_t n); | ||
| 417 | |||
| 418 | 1207 | void init_base_vars() { | |
| 419 | 1207 | xcom_shutdown = 0; /* Xcom_Shutdown flag */ | |
| 420 | 1207 | executed_msg = null_synode; /* The message we are waiting to execute */ | |
| 421 | 1207 | max_synode = null_synode; /* Max message number seen so far */ | |
| 422 | 1207 | boot = nullptr; | |
| 423 | 1207 | detector = nullptr; | |
| 424 | 1207 | killer = nullptr; | |
| 425 | 1207 | net_boot = nullptr; | |
| 426 | 1207 | net_recover = nullptr; | |
| 427 | 1207 | xcom_thread_input = nullptr; | |
| 428 | 1207 | } | |
| 429 | |||
| 430 | static task_env *executor = nullptr; | ||
| 431 | static task_env *sweeper = nullptr; | ||
| 432 | static task_env *retry = nullptr; | ||
| 433 | static task_env *proposer[PROPOSERS]; | ||
| 434 | static task_env *alive_t = nullptr; | ||
| 435 | static task_env *cache_task = nullptr; | ||
| 436 | |||
| 437 | static uint32_t my_id = 0; /* Unique id of this instance */ | ||
| 438 | 872539 | uint32_t get_my_xcom_id() { return my_id; } | |
| 439 | static synode_no current_message; /* Current message number */ | ||
| 440 | static synode_no | ||
| 441 | last_config_modification_id; /*Last configuration change proposal*/ | ||
| 442 | static uint64_t lsn = 0; /* Current log sequence number */ | ||
| 443 | |||
| 444 | 86003 | synode_no get_current_message() { return current_message; } | |
| 445 | |||
| 446 | static channel prop_input_queue; /* Proposer task input queue */ | ||
| 447 | |||
| 448 | enum class synode_allocation_type { todo = 0, local, remote, global }; | ||
| 449 | enum class synode_reservation_status : int { | ||
| 450 | number_ok, | ||
| 451 | no_nodes, | ||
| 452 | delivery_timeout | ||
| 453 | }; | ||
| 454 | |||
| 455 | #if 0 | ||
| 456 | static char const *synode_allocation_type_to_str(synode_allocation_type x) { | ||
| 457 | switch (x) { | ||
| 458 | case synode_allocation_type::todo: | ||
| 459 | return "todo"; | ||
| 460 | case synode_allocation_type::local: | ||
| 461 | return "local"; | ||
| 462 | case synode_allocation_type::remote: | ||
| 463 | return "remote"; | ||
| 464 | case synode_allocation_type::global: | ||
| 465 | return "global"; | ||
| 466 | default: | ||
| 467 | return ""; | ||
| 468 | } | ||
| 469 | } | ||
| 470 | #endif | ||
| 471 | |||
| 472 | // A pool of synode numbers implemented as a queue | ||
| 473 | struct synode_pool { | ||
| 474 | std::queue<std::pair<synode_no, synode_allocation_type>> data; | ||
| 475 | linkage queue; | ||
| 476 | |||
| 477 | 1605 | synode_pool() { link_init(&queue, TYPE_HASH("task_env")); } | |
| 478 | |||
| 479 | 456 | void put(synode_no synode, synode_allocation_type allocation) { | |
| 480 |
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456 | data.push({synode, allocation}); |
| 481 | 456 | task_wakeup(&queue); | |
| 482 | 456 | } | |
| 483 | |||
| 484 | 456 | auto get() { | |
| 485 | 456 | auto retval = data.front(); | |
| 486 | 456 | data.pop(); | |
| 487 | 456 | return retval; | |
| 488 | } | ||
| 489 | |||
| 490 | 96918 | bool empty() { return data.empty(); } | |
| 491 | }; | ||
| 492 | |||
| 493 | synode_pool synode_number_pool; | ||
| 494 | |||
| 495 | extern int client_boot_done; | ||
| 496 | extern int netboot_ok; | ||
| 497 | |||
| 498 | static linkage exec_wait = { | ||
| 499 | 0, &exec_wait, &exec_wait}; /* Executor will wake up tasks sleeping here */ | ||
| 500 | |||
| 501 | linkage detector_wait = {0, &detector_wait, | ||
| 502 | &detector_wait}; /* Detector sleeps here */ | ||
| 503 | |||
| 504 | static struct { | ||
| 505 | int n; | ||
| 506 | unsigned long id[MAX_DEAD]; | ||
| 507 | } dead_sites; | ||
| 508 | |||
| 509 | 2812132 | synode_no get_max_synode() { return max_synode; } | |
| 510 | |||
| 511 | 1837312 | static bool_t is_latest_config(site_def const *const config) { | |
| 512 | 1837312 | site_def const *const latest_config = get_site_def(); | |
| 513 |
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1837312 | assert(latest_config != nullptr); |
| 514 | 1837312 | return config == latest_config; | |
| 515 | } | ||
| 516 | |||
| 517 | /** | ||
| 518 | * Get the first pending configuration that reconfigures the event horizon. | ||
| 519 | * | ||
| 520 | * Retrieve the first pending site_def, i.e. with the smallest start synod that | ||
| 521 | * is greater than executed_msg, that reconfigures the event horizon. | ||
| 522 | */ | ||
| 523 | 1831243 | static site_def const *first_event_horizon_reconfig() { | |
| 524 | 1831243 | site_def const *active_config = find_site_def(executed_msg); | |
| 525 | 1831243 | xcom_event_horizon active_event_horizon = active_config->event_horizon; | |
| 526 | 1831243 | site_def const *first_event_horizon_reconfig = nullptr; | |
| 527 | 1831243 | site_def const *next_config = nullptr; | |
| 528 | 1831243 | for (next_config = find_next_site_def(active_config->start); | |
| 529 |
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2310697 | next_config != nullptr && first_event_horizon_reconfig == nullptr; |
| 530 | 479454 | next_config = find_next_site_def(next_config->start)) { | |
| 531 |
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479454 | if (active_event_horizon != next_config->event_horizon) { |
| 532 | 2610 | first_event_horizon_reconfig = next_config; | |
| 533 | } | ||
| 534 | } | ||
| 535 | 1831243 | return first_event_horizon_reconfig; | |
| 536 | } | ||
| 537 | |||
| 538 | /** | ||
| 539 | * Get the latest pending configuration that reconfigures the event horizon. | ||
| 540 | * | ||
| 541 | * Retrieve the last pending site_def, i.e. with the greatest start synod that | ||
| 542 | * is greater than executed_msg, that reconfigures the event horizon. | ||
| 543 | */ | ||
| 544 | 6069 | static site_def const *latest_event_horizon_reconfig() { | |
| 545 | 6069 | site_def const *active_config = find_site_def(executed_msg); | |
| 546 | 6069 | xcom_event_horizon previous_event_horizon = active_config->event_horizon; | |
| 547 | 6069 | site_def const *last_event_horizon_reconfig = nullptr; | |
| 548 | 6069 | site_def const *next_config = nullptr; | |
| 549 | 6069 | for (next_config = find_next_site_def(active_config->start); | |
| 550 |
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6238 | next_config != nullptr; |
| 551 | 169 | next_config = find_next_site_def(next_config->start)) { | |
| 552 |
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169 | if (previous_event_horizon != next_config->event_horizon) { |
| 553 | 3 | previous_event_horizon = next_config->event_horizon; | |
| 554 | 3 | last_event_horizon_reconfig = next_config; | |
| 555 | } | ||
| 556 | } | ||
| 557 | 6069 | return last_event_horizon_reconfig; | |
| 558 | } | ||
| 559 | |||
| 560 | /** | ||
| 561 | * Add the event horizon to the given base synod s. | ||
| 562 | * | ||
| 563 | * We are assuming right now that this function is used solely in the context of | ||
| 564 | * "we have received a reconfiguration command at synod s, when should it be | ||
| 565 | * scheduled to take effect?" | ||
| 566 | * The result of this function is *when* it should take effect. | ||
| 567 | * | ||
| 568 | * Common case: there are no configurations pending, or if there are, none of | ||
| 569 | * them reconfigure the event horizon. The common case result is: | ||
| 570 | * | ||
| 571 | * s + event_horizon(active_config) + 1 | ||
| 572 | * | ||
| 573 | * | ||
| 574 | * If an event horizon reconfiguration R is pending, it means that the command C | ||
| 575 | * proposed for synod s is concurrent with R, i.e., s falls in the interval | ||
| 576 | * ]proposed(R), start(R)[. | ||
| 577 | * | ||
| 578 | * In this situation we apply the command C proposed for synod s *after* taking | ||
| 579 | * into account R's event horizon. | ||
| 580 | * | ||
| 581 | * This means that the result is: | ||
| 582 | * | ||
| 583 | * start(R) + event_horizon(R) + 1 | ||
| 584 | */ | ||
| 585 | #ifdef PERMISSIVE_EH_ACTIVE_CONFIG | ||
| 586 | /* purecov: begin deadcode */ | ||
| 587 | static synode_no add_default_event_horizon(synode_no s) { | ||
| 588 | s.msgno += EVENT_HORIZON_MIN + 1; | ||
| 589 | return s; | ||
| 590 | } | ||
| 591 | /* purecov: end */ | ||
| 592 | #endif | ||
| 593 | |||
| 594 | 6069 | static synode_no add_event_horizon(synode_no s) { | |
| 595 | 6069 | site_def const *active_config = find_site_def(executed_msg); | |
| 596 |
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6069 | if (active_config) { |
| 597 | 6069 | site_def const *pending_config = latest_event_horizon_reconfig(); | |
| 598 | 6069 | bool_t const no_event_horizon_reconfig_pending = | |
| 599 | 6069 | (pending_config == nullptr); | |
| 600 |
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6069 | if (is_latest_config(active_config) || no_event_horizon_reconfig_pending) { |
| 601 | 6066 | s.msgno = s.msgno + active_config->event_horizon + 1; | |
| 602 | } else { | ||
| 603 | 3 | s.msgno = pending_config->start.msgno + pending_config->event_horizon + 1; | |
| 604 | } | ||
| 605 | 6069 | return s; | |
| 606 | } else { /* This is initial boot or recovery, we have no config */ | ||
| 607 | #ifdef PERMISSIVE_EH_ACTIVE_CONFIG | ||
| 608 | return add_default_event_horizon(s); | ||
| 609 | #else | ||
| 610 | /* We should always have an active config */ | ||
| 611 | /* purecov: begin deadcode */ | ||
| 612 | ✗ | assert(active_config != nullptr); | |
| 613 | ✗ | return null_synode; | |
| 614 | /* purecov: end */ | ||
| 615 | #endif | ||
| 616 | } | ||
| 617 | } | ||
| 618 | |||
| 619 | /** | ||
| 620 | Set node group | ||
| 621 | */ | ||
| 622 | 12329 | void set_group(uint32_t id) { | |
| 623 | IFDBG(D_NONE, FN; STRLIT("changing group id of global variables "); | ||
| 624 | NDBG((unsigned long)id, lu);); | ||
| 625 | /* set_group_id(id); */ | ||
| 626 | 12329 | current_message.group_id = id; | |
| 627 | 12329 | executed_msg.group_id = id; | |
| 628 | 12329 | max_synode.group_id = id; | |
| 629 | 12329 | } | |
| 630 | |||
| 631 | 2348 | static void bury_site(uint32_t id) { | |
| 632 |
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2348 | if (id != 0) { |
| 633 | ✗ | dead_sites.id[dead_sites.n % MAX_DEAD] = id; | |
| 634 | ✗ | dead_sites.n = (dead_sites.n + 1) % MAX_DEAD; | |
| 635 | } | ||
| 636 | 2348 | } | |
| 637 | |||
| 638 | 659780 | static bool_t is_dead_site(uint32_t id) { | |
| 639 | 659780 | int i = 0; | |
| 640 |
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659780 | for (i = 0; i < MAX_DEAD; i++) { |
| 641 |
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659780 | if (dead_sites.id[i] == id) |
| 642 | 3 | return TRUE; | |
| 643 |
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659777 | else if (dead_sites.id[i] == 0) |
| 644 | 659777 | return FALSE; | |
| 645 | } | ||
| 646 | ✗ | return FALSE; | |
| 647 | } | ||
| 648 | |||
| 649 | extern node_set *init_node_set(node_set *set, u_int n); | ||
| 650 | extern node_set *alloc_node_set(node_set *set, u_int n); | ||
| 651 | |||
| 652 | #if 0 | ||
| 653 | /* Find our previous message number. */ | ||
| 654 | static synode_no decr_msgno(synode_no msgno) | ||
| 655 | { | ||
| 656 | synode_no ret = msgno; | ||
| 657 | ret.msgno--; | ||
| 658 | ret.node = get_nodeno(find_site_def(ret)); /* In case site and node number has changed */ | ||
| 659 | return ret; | ||
| 660 | } | ||
| 661 | #endif | ||
| 662 | |||
| 663 | /* Find our next message number. */ | ||
| 664 | 364518 | static synode_no incr_msgno(synode_no msgno) { | |
| 665 | 364518 | synode_no ret = msgno; | |
| 666 | 364518 | ret.msgno++; | |
| 667 | 364518 | ret.node = get_nodeno( | |
| 668 | find_site_def(ret)); /* In case site and node number has changed */ | ||
| 669 | 364518 | return ret; | |
| 670 | } | ||
| 671 | |||
| 672 | 2067210 | synode_no incr_synode(synode_no synode) { | |
| 673 | 2067210 | synode_no ret = synode; | |
| 674 | 2067210 | ret.node++; | |
| 675 |
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2067210 | if (ret.node >= get_maxnodes(find_site_def(synode))) { |
| 676 | 1038422 | ret.node = 0; | |
| 677 | 1038422 | ret.msgno++; | |
| 678 | } | ||
| 679 | /* IFDBG(D_NONE, FN; SYCEXP(synode); SYCEXP(ret)); */ | ||
| 680 | 2067210 | return ret; /* Change this if we change message number type */ | |
| 681 | } | ||
| 682 | |||
| 683 | #if 0 | ||
| 684 | synode_no decr_synode(synode_no synode) { | ||
| 685 | synode_no ret = synode; | ||
| 686 | if (ret.node == 0) { | ||
| 687 | ret.msgno--; | ||
| 688 | ret.node = get_maxnodes(find_site_def(ret)); | ||
| 689 | } | ||
| 690 | ret.node--; | ||
| 691 | return ret; /* Change this if we change message number type */ | ||
| 692 | } | ||
| 693 | #endif | ||
| 694 | |||
| 695 | 255176 | static void skip_value(pax_msg *p) { | |
| 696 | IFDBG(D_NONE, FN; SYCEXP(p->synode)); | ||
| 697 | 255176 | p->op = learn_op; | |
| 698 | 255176 | p->msg_type = no_op; | |
| 699 | 255176 | } | |
| 700 | |||
| 701 | /* Utilities and debug */ | ||
| 702 | |||
| 703 | #ifndef _WIN32 | ||
| 704 | /* Ignore this signal */ | ||
| 705 | 2362 | static int ignoresig(int signum) { | |
| 706 | struct sigaction act; | ||
| 707 | struct sigaction oldact; | ||
| 708 | |||
| 709 | 2362 | memset(&act, 0, sizeof(act)); | |
| 710 | 2362 | act.sa_handler = SIG_IGN; | |
| 711 | 2362 | memset(&oldact, 0, sizeof(oldact)); | |
| 712 | |||
| 713 | 2362 | return sigaction(signum, &act, &oldact); | |
| 714 | } | ||
| 715 | #else | ||
| 716 | #define SIGPIPE 0 | ||
| 717 | static int ignoresig(int signum) { return 0; } | ||
| 718 | #endif | ||
| 719 | |||
| 720 | 687753 | static int recently_active(pax_machine *p) { | |
| 721 | IFDBG(D_NONE, FN; SYCEXP(p->synode); STRLIT(" op "); PTREXP(p); | ||
| 722 | STRLIT(p->learner.msg ? pax_op_to_str(p->learner.msg->op) : "NULL"); | ||
| 723 | NDBG(p->last_modified, f); NDBG(task_now(), f)); | ||
| 724 |
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932876 | return p->last_modified != 0.0 && |
| 725 |
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932876 | (p->last_modified + BUILD_TIMEOUT + median_time()) > task_now(); |
| 726 | } | ||
| 727 | |||
| 728 | 3566621 | static inline int finished(pax_machine *p) { | |
| 729 | IFDBG(D_NONE, FN; SYCEXP(p->synode); STRLIT(" op "); PTREXP(p); | ||
| 730 | STRLIT(p->learner.msg ? pax_op_to_str(p->learner.msg->op) : "NULL");); | ||
| 731 |
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3605977 | return p->learner.msg && (p->learner.msg->op == learn_op || |
| 732 |
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3605977 | p->learner.msg->op == tiny_learn_op); |
| 733 | } | ||
| 734 | |||
| 735 | 54687 | int pm_finished(pax_machine *p) { return finished(p); } | |
| 736 | |||
| 737 | 208639 | static inline int accepted(pax_machine *p) { | |
| 738 | IFDBG(D_NONE, FN; SYCEXP(p->synode); STRLIT(" op "); PTREXP(p); | ||
| 739 | STRLIT(p->acceptor.msg ? pax_op_to_str(p->acceptor.msg->op) : "NULL");); | ||
| 740 |
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208639 | return p->acceptor.msg && p->acceptor.msg->op != initial_op; |
| 741 | } | ||
| 742 | |||
| 743 | 15691 | static inline int accepted_noop(pax_machine *p) { | |
| 744 | IFDBG(D_NONE, FN; SYCEXP(p->synode); STRLIT(" op "); PTREXP(p); | ||
| 745 | STRLIT(p->acceptor.msg ? pax_op_to_str(p->acceptor.msg->op) : "NULL");); | ||
| 746 |
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15691 | return accepted(p) && p->acceptor.msg->msg_type == no_op; |
| 747 | } | ||
| 748 | |||
| 749 | 19920 | static inline int noop_match(pax_machine *p, pax_msg *pm) { | |
| 750 |
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19920 | return pm->msg_type == no_op && accepted_noop(p); |
| 751 | } | ||
| 752 | |||
| 753 | 156638 | static inline int started(pax_machine *p) { | |
| 754 |
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156638 | return p->op != initial_op || (p->acceptor.promise.cnt > 0) || |
| 755 |
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313228 | (p->proposer.msg && (p->proposer.msg->op != initial_op)) || |
| 756 |
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469890 | accepted(p) || finished(p); |
| 757 | } | ||
| 758 | |||
| 759 | 11418 | void set_last_received_config(synode_no received_config_change) { | |
| 760 | 11418 | last_config_modification_id = received_config_change; | |
| 761 | 11418 | } | |
| 762 | |||
| 763 | /* Definition of majority */ | ||
| 764 | 485715 | static inline node_no max_check(site_def const *site) { | |
| 765 | #ifdef MAXACCEPT | ||
| 766 | return MIN(get_maxnodes(site), MAXACCEPT); | ||
| 767 | #else | ||
| 768 | 485715 | return get_maxnodes(site); | |
| 769 | #endif | ||
| 770 | } | ||
| 771 | |||
| 772 | static site_def *forced_config = nullptr; | ||
| 773 | 67919 | static int is_forcing_node(pax_machine const *p) { return p->enforcer; } | |
| 774 | static int wait_forced_config = 0; | ||
| 775 | |||
| 776 | /* Definition of majority */ | ||
| 777 | 485715 | static inline int majority(bit_set const *nodeset, site_def const *s, int all, | |
| 778 | int delay [[maybe_unused]], int force) { | ||
| 779 | 485715 | node_no ok = 0; | |
| 780 | 485715 | node_no i = 0; | |
| 781 | 485715 | int retval = 0; | |
| 782 | #ifdef WAIT_FOR_ALL_FIRST | ||
| 783 | double sec = task_now(); | ||
| 784 | #endif | ||
| 785 | 485715 | node_no max = max_check(s); | |
| 786 | |||
| 787 | /* IFDBG(D_NONE, FN; NDBG(max,lu); NDBG(all,d); NDBG(delay,d); NDBG(force,d)); | ||
| 788 | */ | ||
| 789 | |||
| 790 | /* Count nodes that has answered */ | ||
| 791 |
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1608174 | for (i = 0; i < max; i++) { |
| 792 |
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1122459 | if (BIT_ISSET(i, nodeset)) { |
| 793 | 697852 | ok++; | |
| 794 | } | ||
| 795 | #ifdef WAIT_FOR_ALL_FIRST | ||
| 796 | else { | ||
| 797 | if (all) return 0; /* Delay until all nodes have answered */ | ||
| 798 | if (delay && !may_be_dead(s->detected, i, sec)) { | ||
| 799 | return 0; /* Delay until all live nodes have answered */ | ||
| 800 | } | ||
| 801 | } | ||
| 802 | #endif | ||
| 803 | } | ||
| 804 | |||
| 805 | /* If we are forcing messages, attempt to ensure consistency by | ||
| 806 | requiring all remaining nodes to agree. Forced_config points to | ||
| 807 | the config that should be used as acceptors in this | ||
| 808 | case. Another possibility is to use the original config and | ||
| 809 | count the number of live nodes, but since the force flag is | ||
| 810 | being used only to force a new config, it seems safer to use | ||
| 811 | the new config and no time-dependent info. Note that we are | ||
| 812 | counting the answers based on the normal config, but use the | ||
| 813 | number of nodes from forced_config. This is safe, since we can | ||
| 814 | assume that the nodes that are not in forced_config will never | ||
| 815 | answer. */ | ||
| 816 | |||
| 817 |
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485715 | if (force) { |
| 818 | IFDBG(D_NONE, FN; STRLIT("force majority"); NDBG(ok, u); NDBG(max, u); | ||
| 819 | NDBG(get_maxnodes(forced_config), u)); | ||
| 820 | 6533 | return ok == get_maxnodes(forced_config); | |
| 821 | } else { | ||
| 822 | /* Have now seen answer from all live nodes */ | ||
| 823 | #ifdef NODE_0_IS_ARBITRATOR | ||
| 824 | retval = all ? ok == max | ||
| 825 | : ok > max / 2 || | ||
| 826 | (ARBITRATOR_HACK && (get_nodeno(s) == 0) && (2 == max)); | ||
| 827 | #else | ||
| 828 |
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479182 | retval = all ? ok == max : ok > max / 2 || (ARBITRATOR_HACK && (2 == max)); |
| 829 | #endif | ||
| 830 | /* IFDBG(D_NONE, FN; NDBG(max,lu); NDBG(all,d); NDBG(delay,d); | ||
| 831 | * NDBG(retval,d)); */ | ||
| 832 | 479182 | return retval; | |
| 833 | } | ||
| 834 | } | ||
| 835 | |||
| 836 | #define IS_CONS_ALL(p) \ | ||
| 837 | ((p)->proposer.msg->a ? (p)->proposer.msg->a->consensus == cons_all : 0) | ||
| 838 | |||
| 839 | /* See if a majority of acceptors have answered our prepare */ | ||
| 840 | 61554 | static int prep_majority(site_def const *site, pax_machine const *p) { | |
| 841 | 61554 | int ok = 0; | |
| 842 | |||
| 843 |
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61554 | assert(p); |
| 844 |
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61554 | assert(p->proposer.prep_nodeset); |
| 845 |
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61554 | assert(p->proposer.msg); |
| 846 | /* IFDBG(D_NONE, FN; BALCEXP(p->proposer.bal)); */ | ||
| 847 |
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61554 | ok = majority(p->proposer.prep_nodeset, site, IS_CONS_ALL(p), |
| 848 |
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61554 | p->proposer.bal.cnt <= 1, |
| 849 |
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61554 | p->proposer.msg->force_delivery || p->force_delivery); |
| 850 | 61554 | return ok; | |
| 851 | } | ||
| 852 | |||
| 853 | /* See if a majority of acceptors have answered our propose */ | ||
| 854 | 424161 | static int prop_majority(site_def const *site, pax_machine const *p) { | |
| 855 | 424161 | int ok = 0; | |
| 856 | |||
| 857 |
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424161 | assert(p); |
| 858 |
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424161 | assert(p->proposer.prop_nodeset); |
| 859 |
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424161 | assert(p->proposer.msg); |
| 860 | /* IFDBG(D_NONE, FN; BALCEXP(p->proposer.bal)); */ | ||
| 861 |
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424161 | ok = majority(p->proposer.prop_nodeset, site, IS_CONS_ALL(p), |
| 862 |
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424161 | p->proposer.bal.cnt <= 1, |
| 863 |
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424161 | p->proposer.msg->force_delivery || p->force_delivery); |
| 864 | 424161 | return ok; | |
| 865 | } | ||
| 866 | |||
| 867 | /* Xcom thread */ | ||
| 868 | |||
| 869 | static site_def *executor_site = nullptr; | ||
| 870 | |||
| 871 | 1312 | site_def const *get_executor_site() { return executor_site; } | |
| 872 | 86017 | site_def *get_executor_site_rw() { return executor_site; } | |
| 873 | |||
| 874 | static site_def *proposer_site = nullptr; | ||
| 875 | |||
| 876 | ✗ | site_def const *get_proposer_site() { return proposer_site; } | |
| 877 | |||
| 878 | /* delivered_msg may point to a no_op message, which will not actually be | ||
| 879 | * delivered */ | ||
| 880 | static synode_no delivered_msg = NULL_SYNODE; | ||
| 881 | |||
| 882 | 1757252 | synode_no get_delivered_msg() { return delivered_msg; } | |
| 883 | |||
| 884 | /* last_delivered_msg is the last synode we actually delivered */ | ||
| 885 | static synode_no last_delivered_msg = NULL_SYNODE; | ||
| 886 | 1313 | synode_no get_last_delivered_msg() { return last_delivered_msg; } | |
| 887 | |||
| 888 | 3397 | void init_xcom_base() { | |
| 889 | IFDBG(D_NONE, FN); | ||
| 890 | 3397 | xcom_shutdown = 0; | |
| 891 | 3397 | current_message = null_synode; | |
| 892 | 3397 | executed_msg = null_synode; | |
| 893 | 3397 | delivered_msg = null_synode; | |
| 894 | 3397 | last_delivered_msg = null_synode; | |
| 895 | 3397 | max_synode = null_synode; | |
| 896 | 3397 | client_boot_done = 0; | |
| 897 | 3397 | netboot_ok = 0; | |
| 898 | |||
| 899 | 3397 | xcom_recover_init(); | |
| 900 | 3397 | my_id = new_id(); | |
| 901 | 3397 | push_site_def(nullptr); | |
| 902 | /* update_servers(NULL); */ | ||
| 903 | 3397 | xcom_cache_var_init(); | |
| 904 | 3397 | median_filter_init(); | |
| 905 | 3397 | link_init(&exec_wait, TYPE_HASH("task_env")); | |
| 906 | 3397 | link_init(&detector_wait, TYPE_HASH("task_env")); | |
| 907 | 3397 | link_init(&connect_wait, TYPE_HASH("task_env")); | |
| 908 | 3397 | executor_site = nullptr; | |
| 909 | 3397 | proposer_site = nullptr; | |
| 910 | |||
| 911 | /** Reset lsn */ | ||
| 912 | 3397 | initialize_lsn(0); | |
| 913 | IFDBG(D_NONE, FN); | ||
| 914 | 3397 | } | |
| 915 | |||
| 916 | 3555 | static void init_tasks() { | |
| 917 | IFDBG(D_NONE, FN); | ||
| 918 | 3555 | set_task(&boot, nullptr); | |
| 919 | 3555 | set_task(&net_boot, nullptr); | |
| 920 | 3555 | set_task(&net_recover, nullptr); | |
| 921 | 3555 | set_task(&killer, nullptr); | |
| 922 | 3555 | set_task(&executor, nullptr); | |
| 923 | 3555 | set_task(&retry, nullptr); | |
| 924 | 3555 | set_task(&detector, nullptr); | |
| 925 | 3555 | init_proposers(); | |
| 926 | 3555 | set_task(&alive_t, nullptr); | |
| 927 | 3555 | set_task(&sweeper, nullptr); | |
| 928 | 3555 | set_task(&cache_task, nullptr); | |
| 929 | IFDBG(D_NONE, FN); | ||
| 930 | 3555 | } | |
| 931 | |||
| 932 | /* Initialize the xcom thread */ | ||
| 933 | 1207 | void xcom_thread_init() { | |
| 934 | #ifndef NO_SIGPIPE | ||
| 935 | 1207 | signal(SIGPIPE, SIG_IGN); | |
| 936 | #endif | ||
| 937 | 1207 | init_base_vars(); | |
| 938 | 1207 | init_site_vars(); | |
| 939 | 1207 | init_crc32c(); | |
| 940 | 1207 | xcom_srand48((long int)task_now()); | |
| 941 | |||
| 942 | 1207 | init_xcom_base(); | |
| 943 | 1207 | init_tasks(); | |
| 944 | |||
| 945 | /* Initialize input queue */ | ||
| 946 | 1207 | channel_init(&prop_input_queue, TYPE_HASH("msg_link")); | |
| 947 | 1207 | init_link_list(); | |
| 948 | 1207 | task_sys_init(); | |
| 949 | |||
| 950 | 1207 | init_cache(); | |
| 951 | 1207 | } | |
| 952 | |||
| 953 | /* Empty the proposer input queue */ | ||
| 954 | 7949 | static void empty_prop_input_queue() { | |
| 955 | 7949 | empty_msg_channel(&prop_input_queue); | |
| 956 | IFDBG(D_NONE, FN; STRLIT("prop_input_queue empty")); | ||
| 957 | 7949 | } | |
| 958 | |||
| 959 | 7949 | static void empty_synode_number_pool() { | |
| 960 |
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7949 | while (!synode_number_pool.data.empty()) { |
| 961 | ✗ | synode_number_pool.data.pop(); | |
| 962 | } | ||
| 963 | 7949 | } | |
| 964 | |||
| 965 | /* De-initialize the xcom thread */ | ||
| 966 | 2355 | void xcom_thread_deinit() { | |
| 967 | IFDBG(D_BUG, FN; STRLIT("Empty proposer input queue")); | ||
| 968 | 2355 | empty_prop_input_queue(); | |
| 969 | IFDBG(D_BUG, FN; STRLIT("Empty synode number pool")); | ||
| 970 | 2355 | empty_synode_number_pool(); | |
| 971 | IFDBG(D_BUG, FN; STRLIT("Empty link free list")); | ||
| 972 | 2355 | empty_link_free_list(); | |
| 973 | IFDBG(D_BUG, FN; STRLIT("De-initialize cache")); | ||
| 974 | 2355 | deinit_cache(); | |
| 975 | 2355 | garbage_collect_servers(); | |
| 976 | IFDBG(D_BUG, FN; STRLIT("De-initialize network cache")); | ||
| 977 | 2355 | deinit_network_cache(); | |
| 978 | IFDBG(D_BUG, FN; STRLIT("De-initialize xcom_interface")); | ||
| 979 | 2355 | deinit_xcom_interface(); | |
| 980 | 2355 | } | |
| 981 | |||
| 982 | #define PROP_ITER \ | ||
| 983 | int i; \ | ||
| 984 | for (i = 0; i < PROPOSERS; i++) | ||
| 985 | |||
| 986 | 5745 | static void init_proposers() { | |
| 987 |
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63195 | PROP_ITER { set_task(&proposer[i], nullptr); } |
| 988 | 5745 | } | |
| 989 | |||
| 990 | 2197 | static void create_proposers() { | |
| 991 |
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24167 | PROP_ITER { |
| 992 | 21970 | set_task(&proposer[i], task_new(proposer_task, int_arg(i), "proposer_task", | |
| 993 | XCOM_THREAD_DEBUG)); | ||
| 994 | } | ||
| 995 | 2197 | } | |
| 996 | |||
| 997 | static synode_no *proposer_synodes[PROPOSERS]; | ||
| 998 | |||
| 999 | 43870 | static void add_proposer_synode(int i, synode_no *syn_ptr) { | |
| 1000 |
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43870 | if (i >= 0 && i < PROPOSERS) { |
| 1001 | 43870 | proposer_synodes[i] = syn_ptr; | |
| 1002 | } | ||
| 1003 | 43870 | } | |
| 1004 | |||
| 1005 | 21900 | static void remove_proposer_synode(int i) { add_proposer_synode(i, nullptr); } | |
| 1006 | |||
| 1007 | 78925 | static synode_no get_proposer_synode(int i) { | |
| 1008 |
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78925 | if (i >= 0 && i < PROPOSERS && proposer_synodes[i]) { |
| 1009 | 78925 | return *proposer_synodes[i]; | |
| 1010 | } else { | ||
| 1011 | ✗ | return null_synode; | |
| 1012 | } | ||
| 1013 | } | ||
| 1014 | |||
| 1015 | 6661 | static synode_no min_proposer_synode() { | |
| 1016 | synode_no s_min; | ||
| 1017 | int i; | ||
| 1018 |
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6661 | for (i = 0; i < PROPOSERS; i++) { |
| 1019 | 6661 | s_min = get_proposer_synode(i); | |
| 1020 |
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6661 | if (!synode_eq(null_synode, s_min)) break; // Initial value |
| 1021 | } | ||
| 1022 |
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73271 | for (; i < PROPOSERS; i++) { |
| 1023 |
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|
66610 | if (synode_lt(get_proposer_synode(i), s_min)) |
| 1024 | 5654 | s_min = get_proposer_synode(i); | |
| 1025 | } | ||
| 1026 | 6661 | return s_min; | |
| 1027 | } | ||
| 1028 | |||
| 1029 | 2190 | static void terminate_proposers() { | |
| 1030 |
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24090 | PROP_ITER { task_terminate(proposer[i]); } |
| 1031 | 2190 | } | |
| 1032 | |||
| 1033 | 4595 | static void free_forced_config_site_def() { | |
| 1034 | 4595 | free_site_def(forced_config); | |
| 1035 | 4595 | forced_config = nullptr; | |
| 1036 | 4595 | } | |
| 1037 | |||
| 1038 | #if TASK_DBUG_ON | ||
| 1039 | [[maybe_unused]] static void dbg_proposers(); | ||
| 1040 | static void dbg_proposers() { | ||
| 1041 | GET_GOUT; | ||
| 1042 | if (!IS_XCOM_DEBUG_WITH(XCOM_DEBUG_TRACE)) return; | ||
| 1043 | NDBG(PROPOSERS, d); | ||
| 1044 | { | ||
| 1045 | PROP_ITER { PPUT(proposer[i]); } | ||
| 1046 | } | ||
| 1047 | PRINT_GOUT; | ||
| 1048 | FREE_GOUT; | ||
| 1049 | } | ||
| 1050 | #endif | ||
| 1051 | |||
| 1052 | 2197 | static void set_proposer_startpoint() { | |
| 1053 | IFDBG(D_NONE, FN; STRLIT("changing current message")); | ||
| 1054 |
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2197 | if (synode_gt(max_synode, get_current_message())) { |
| 1055 |
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1360 | if (max_synode.msgno <= 1) |
| 1056 | ✗ | set_current_message(first_free_synode_local(max_synode)); | |
| 1057 | else | ||
| 1058 | 1360 | set_current_message(incr_msgno(first_free_synode_local(max_synode))); | |
| 1059 | } | ||
| 1060 |
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2197 | if (synode_gt(executed_msg, get_current_message())) { |
| 1061 | ✗ | set_current_message(first_free_synode_local(executed_msg)); | |
| 1062 | } | ||
| 1063 | 2197 | } | |
| 1064 | |||
| 1065 | /* Task functions */ | ||
| 1066 | |||
| 1067 | static xcom_state_change_cb xcom_run_cb = nullptr; | ||
| 1068 | static xcom_state_change_cb xcom_terminate_cb = nullptr; | ||
| 1069 | static xcom_state_change_cb xcom_comms_cb = nullptr; | ||
| 1070 | static xcom_state_change_cb xcom_exit_cb = nullptr; | ||
| 1071 | static xcom_state_change_cb xcom_expel_cb = nullptr; | ||
| 1072 | static xcom_input_try_pop_cb xcom_try_pop_from_input_cb = nullptr; | ||
| 1073 | static xcom_recovery_cb MY_ATTRIBUTE((unused)) recovery_begin_cb = nullptr; | ||
| 1074 | static xcom_recovery_cb MY_ATTRIBUTE((unused)) recovery_restart_cb = nullptr; | ||
| 1075 | static xcom_recovery_cb MY_ATTRIBUTE((unused)) recovery_init_cb = nullptr; | ||
| 1076 | static xcom_recovery_cb MY_ATTRIBUTE((unused)) recovery_end_cb = nullptr; | ||
| 1077 | |||
| 1078 | 2302 | void set_xcom_run_cb(xcom_state_change_cb x) { xcom_run_cb = x; } | |
| 1079 | 2302 | void set_xcom_exit_cb(xcom_state_change_cb x) { xcom_exit_cb = x; } | |
| 1080 | 2302 | void set_xcom_comms_cb(xcom_state_change_cb x) { xcom_comms_cb = x; } | |
| 1081 | 2302 | void set_xcom_expel_cb(xcom_state_change_cb x) { xcom_expel_cb = x; } | |
| 1082 | |||
| 1083 | 2302 | void set_xcom_input_try_pop_cb(xcom_input_try_pop_cb pop) { | |
| 1084 | 2302 | xcom_try_pop_from_input_cb = pop; | |
| 1085 | 2302 | } | |
| 1086 | |||
| 1087 | #ifdef XCOM_STANDALONE | ||
| 1088 | /* purecov: begin deadcode */ | ||
| 1089 | void set_xcom_terminate_cb(xcom_state_change_cb x) { xcom_terminate_cb = x; } | ||
| 1090 | /* purecov: end */ | ||
| 1091 | |||
| 1092 | /* purecov: begin deadcode */ | ||
| 1093 | void set_xcom_recovery_begin_cb(xcom_recovery_cb x) { recovery_begin_cb = x; } | ||
| 1094 | /* purecov: end */ | ||
| 1095 | |||
| 1096 | /* purecov: begin deadcode */ | ||
| 1097 | void set_xcom_recovery_restart_cb(xcom_recovery_cb x) { | ||
| 1098 | recovery_restart_cb = x; | ||
| 1099 | } | ||
| 1100 | /* purecov: end */ | ||
| 1101 | |||
| 1102 | /* purecov: begin deadcode */ | ||
| 1103 | void set_xcom_recovery_init_cb(xcom_recovery_cb x) { recovery_init_cb = x; } | ||
| 1104 | /* purecov: end */ | ||
| 1105 | |||
| 1106 | /* purecov: begin deadcode */ | ||
| 1107 | void set_xcom_recovery_end_cb(xcom_recovery_cb x) { recovery_end_cb = x; } | ||
| 1108 | /* purecov: end */ | ||
| 1109 | #endif | ||
| 1110 | |||
| 1111 | /** | ||
| 1112 | * These fields are used to signal XCom's request queue. After a request | ||
| 1113 | * is added, one will write 1 byte to warn local_server_task that it has work to | ||
| 1114 | * do. | ||
| 1115 | * | ||
| 1116 | * We use two types of signalling connection: | ||
| 1117 | * - An anonymous pipe, when possible, in POSIX compatible systems | ||
| 1118 | * - A regular socket connection, in Windows | ||
| 1119 | * | ||
| 1120 | * input_signal_connection is the connection_descriptor returned when one opens | ||
| 1121 | * a local signalling connection. It will contain either: | ||
| 1122 | * - The write side of a connection, in case of using a pipe OR; | ||
| 1123 | * - A bidirectional connection, when using a regular socket connection; | ||
| 1124 | * | ||
| 1125 | * input_signal_connection_pipe is the connection_descriptor that holds the read | ||
| 1126 | * side of a pipe connection. It is only allocated when we are able to have | ||
| 1127 | * a pipe connection. | ||
| 1128 | */ | ||
| 1129 | |||
| 1130 | static connection_descriptor *input_signal_connection{nullptr}; | ||
| 1131 | |||
| 1132 | connection_descriptor *input_signal_connection_pipe{nullptr}; | ||
| 1133 | int pipe_signal_connections[2] = {-1, -1}; | ||
| 1134 | |||
| 1135 | #ifndef XCOM_WITHOUT_OPENSSL | ||
| 1136 | ✗ | static bool_t xcom_input_signal_connection_shutdown_ssl_wait_for_peer() { | |
| 1137 | ✗ | int ssl_error_code = 0; | |
| 1138 | do { | ||
| 1139 | char buf[1024]; | ||
| 1140 | ✗ | ssl_error_code = SSL_read(input_signal_connection->ssl_fd, buf, 1024); | |
| 1141 | ✗ | } while (ssl_error_code > 0); | |
| 1142 | |||
| 1143 | { | ||
| 1144 | bool_t const successful = | ||
| 1145 | ✗ | (SSL_get_error(input_signal_connection->ssl_fd, ssl_error_code) == | |
| 1146 | ✗ | SSL_ERROR_ZERO_RETURN); | |
| 1147 | ✗ | return successful; | |
| 1148 | } | ||
| 1149 | } | ||
| 1150 | |||
| 1151 | ✗ | static bool_t xcom_input_signal_connection_shutdown_ssl() { | |
| 1152 | ✗ | bool_t successful = FALSE; | |
| 1153 | |||
| 1154 | ✗ | int ssl_error_code = SSL_shutdown(input_signal_connection->ssl_fd); | |
| 1155 | |||
| 1156 | ✗ | bool_t const need_to_wait_for_peer_shutdown = (ssl_error_code == 0); | |
| 1157 | ✗ | bool_t const something_went_wrong = (ssl_error_code < 0); | |
| 1158 | ✗ | if (need_to_wait_for_peer_shutdown) { | |
| 1159 | ✗ | successful = xcom_input_signal_connection_shutdown_ssl_wait_for_peer(); | |
| 1160 | ✗ | if (!successful) goto end; | |
| 1161 | ✗ | } else if (something_went_wrong) { | |
| 1162 | ✗ | goto end; | |
| 1163 | } | ||
| 1164 | |||
| 1165 | ✗ | ssl_free_con(input_signal_connection); | |
| 1166 | ✗ | successful = TRUE; | |
| 1167 | |||
| 1168 | ✗ | end: | |
| 1169 | ✗ | return successful; | |
| 1170 | } | ||
| 1171 | #endif | ||
| 1172 | |||
| 1173 | 2355 | bool_t xcom_input_new_signal_connection(char const *address, xcom_port port) { | |
| 1174 | 2355 | bool_t const SUCCESSFUL = TRUE; | |
| 1175 | 2355 | bool_t const UNSUCCESSFUL = FALSE; | |
| 1176 |
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2355 | assert(input_signal_connection == nullptr); |
| 1177 | |||
| 1178 |
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2355 | if (input_signal_connection_pipe != nullptr) { |
| 1179 | 2355 | input_signal_connection = | |
| 1180 | 2355 | (connection_descriptor *)malloc(sizeof(connection_descriptor)); | |
| 1181 | 2355 | input_signal_connection->fd = pipe_signal_connections[1]; | |
| 1182 | #ifndef XCOM_WITHOUT_OPENSSL | ||
| 1183 | 2355 | input_signal_connection->ssl_fd = nullptr; | |
| 1184 | #endif | ||
| 1185 | 2355 | set_connected(input_signal_connection, CON_FD); | |
| 1186 | |||
| 1187 |
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2355 | G_INFO("Successfully connected to the local XCom via anonymous pipe"); |
| 1188 | |||
| 1189 | 2355 | return SUCCESSFUL; | |
| 1190 | } else { | ||
| 1191 | /* purecov: begin deadcode */ | ||
| 1192 | /* Try to connect. */ | ||
| 1193 | ✗ | input_signal_connection = open_new_local_connection(address, port); | |
| 1194 | ✗ | if (input_signal_connection->fd == -1) { | |
| 1195 | ✗ | return UNSUCCESSFUL; | |
| 1196 | } | ||
| 1197 | |||
| 1198 | /* Have the server handle the rest of this connection using a local_server | ||
| 1199 | task. */ | ||
| 1200 | ✗ | if (xcom_client_convert_into_local_server(input_signal_connection) == 1) { | |
| 1201 | ✗ | G_TRACE( | |
| 1202 | "Converted the signalling connection handler into a local_server " | ||
| 1203 | "task on the client side."); | ||
| 1204 | |||
| 1205 | #ifndef XCOM_WITHOUT_OPENSSL | ||
| 1206 | /* No more SSL in this connection. */ | ||
| 1207 | ✗ | if (Network_provider_manager::getInstance().get_running_protocol() == | |
| 1208 | XCOM_PROTOCOL) { | ||
| 1209 | ✗ | bool_t const using_ssl = (input_signal_connection->ssl_fd != nullptr); | |
| 1210 | ✗ | if (using_ssl) { | |
| 1211 | ✗ | bool_t successful = xcom_input_signal_connection_shutdown_ssl(); | |
| 1212 | ✗ | if (!successful) { | |
| 1213 | ✗ | G_ERROR( | |
| 1214 | "Error shutting down SSL on XCom's signalling connection on " | ||
| 1215 | "the " | ||
| 1216 | "client side."); | ||
| 1217 | ✗ | xcom_input_free_signal_connection(); | |
| 1218 | ✗ | return UNSUCCESSFUL; | |
| 1219 | } | ||
| 1220 | } | ||
| 1221 | } | ||
| 1222 | #endif | ||
| 1223 | ✗ | G_INFO("Successfully connected to the local XCom via socket connection"); | |
| 1224 | ✗ | return SUCCESSFUL; | |
| 1225 | } else { | ||
| 1226 | ✗ | G_INFO( | |
| 1227 | "Error converting the signalling connection handler into a " | ||
| 1228 | "local_server task on the client side. This will result on a failure " | ||
| 1229 | "to join this node to a configuration"); | ||
| 1230 | ✗ | xcom_input_free_signal_connection(); | |
| 1231 | ✗ | return UNSUCCESSFUL; | |
| 1232 | } | ||
| 1233 | /* purecov: end */ | ||
| 1234 | } | ||
| 1235 | } | ||
| 1236 | |||
| 1237 | 107479 | bool_t xcom_input_signal() { | |
| 1238 | 107479 | bool_t successful = FALSE; | |
| 1239 |
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107479 | if (input_signal_connection != nullptr) { |
| 1240 | 107462 | unsigned char tiny_buf[1] = {0}; | |
| 1241 | int64_t error_code; | ||
| 1242 | 107462 | connnection_write_method to_write_function = | |
| 1243 |
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107462 | input_signal_connection_pipe != nullptr ? con_pipe_write : con_write; |
| 1244 | |||
| 1245 | error_code = | ||
| 1246 |
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107462 | socket_write(input_signal_connection, tiny_buf, 1, to_write_function); |
| 1247 | |||
| 1248 | 107461 | successful = (error_code == 1); | |
| 1249 | } | ||
| 1250 | 107478 | return successful; | |
| 1251 | } | ||
| 1252 | |||
| 1253 | 7004 | void xcom_input_free_signal_connection() { | |
| 1254 |
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7004 | if (input_signal_connection != nullptr) { |
| 1255 |
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2348 | if (input_signal_connection_pipe != nullptr) { |
| 1256 | 2348 | close(input_signal_connection->fd); | |
| 1257 | } else { | ||
| 1258 | /* purecov: begin deadcode */ | ||
| 1259 | ✗ | close_open_connection(input_signal_connection); | |
| 1260 | /* purecov: end */ | ||
| 1261 | } | ||
| 1262 | |||
| 1263 | 2348 | free(input_signal_connection); | |
| 1264 | 2348 | input_signal_connection = nullptr; | |
| 1265 | } | ||
| 1266 | 7004 | } | |
| 1267 | |||
| 1268 | #ifndef XCOM_WITHOUT_OPENSSL | ||
| 1269 | ✗ | static int local_server_shutdown_ssl(connection_descriptor *con, void *buf, | |
| 1270 | int n, int *ret) { | ||
| 1271 | DECL_ENV | ||
| 1272 | int ssl_error_code; | ||
| 1273 | bool_t need_to_wait_for_peer_shutdown; | ||
| 1274 | bool_t something_went_wrong; | ||
| 1275 | int64_t nr_read; | ||
| 1276 | ✗ | ENV_INIT | |
| 1277 | ✗ | END_ENV_INIT | |
| 1278 | END_ENV; | ||
| 1279 | ✗ | *ret = 0; | |
| 1280 | ✗ | TASK_BEGIN | |
| 1281 | ✗ | ep->ssl_error_code = SSL_shutdown(con->ssl_fd); | |
| 1282 | ✗ | ep->need_to_wait_for_peer_shutdown = (ep->ssl_error_code == 0); | |
| 1283 | ✗ | ep->something_went_wrong = (ep->ssl_error_code < 0); | |
| 1284 | ✗ | if (ep->need_to_wait_for_peer_shutdown) { | |
| 1285 | do { | ||
| 1286 | ✗ | TASK_CALL(task_read(con, buf, n, &ep->nr_read)); | |
| 1287 | ✗ | } while (ep->nr_read > 0); | |
| 1288 | ✗ | ep->ssl_error_code = | |
| 1289 | ✗ | SSL_get_error(con->ssl_fd, static_cast<int>(ep->nr_read)); | |
| 1290 | ✗ | ep->something_went_wrong = (ep->ssl_error_code != SSL_ERROR_ZERO_RETURN); | |
| 1291 | } | ||
| 1292 | ✗ | if (ep->something_went_wrong) TERMINATE; | |
| 1293 | ✗ | ssl_free_con(con); | |
| 1294 | ✗ | *ret = 1; | |
| 1295 | ✗ | FINALLY | |
| 1296 | ✗ | TASK_END; | |
| 1297 | } | ||
| 1298 | #endif | ||
| 1299 | |||
| 1300 | 110471 | int local_server(task_arg arg) { | |
| 1301 | DECL_ENV | ||
| 1302 | connection_descriptor rfd; | ||
| 1303 | int ssl_shutdown_ret; | ||
| 1304 | unsigned char buf[1024]; /* arbitrary size */ | ||
| 1305 | int64_t nr_read; | ||
| 1306 | xcom_input_request_ptr request; | ||
| 1307 | xcom_input_request_ptr next_request; | ||
| 1308 | pax_msg *request_pax_msg; | ||
| 1309 | pax_msg *reply_payload; | ||
| 1310 | linkage internal_reply_queue; | ||
| 1311 | msg_link *internal_reply; | ||
| 1312 | bool signaling_connection_error; | ||
| 1313 | connnection_read_method signal_read; | ||
| 1314 | 2355 | ENV_INIT | |
| 1315 | 2355 | rfd.fd = -1; | |
| 1316 | 2355 | ssl_shutdown_ret = 0; | |
| 1317 | 2355 | memset(buf, 0, 1024); | |
| 1318 | 2355 | nr_read = 0; | |
| 1319 | 2355 | request = nullptr; | |
| 1320 | 2355 | link_init(&internal_reply_queue, TYPE_HASH("msg_link")); | |
| 1321 | 2355 | next_request = nullptr; | |
| 1322 | 2355 | request_pax_msg = nullptr; | |
| 1323 | 2355 | reply_payload = nullptr; | |
| 1324 | 2355 | internal_reply = nullptr; | |
| 1325 | 2355 | signaling_connection_error = false; | |
| 1326 | 2355 | END_ENV_INIT | |
| 1327 | END_ENV; | ||
| 1328 |
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|
110471 | TASK_BEGIN |
| 1329 |
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2348 | assert(xcom_try_pop_from_input_cb != nullptr); |
| 1330 | { | ||
| 1331 | 2348 | connection_descriptor *arg_rfd = (connection_descriptor *)get_void_arg(arg); | |
| 1332 | 2348 | ep->rfd = *arg_rfd; | |
| 1333 |
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|
2348 | if (input_signal_connection_pipe == nullptr) free(arg_rfd); |
| 1334 | } | ||
| 1335 | |||
| 1336 | // We will check if we have a pipe open or if we use a classic signalling | ||
| 1337 | // connection. | ||
| 1338 | 2348 | ep->signal_read = | |
| 1339 |
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|
2348 | input_signal_connection_pipe != nullptr ? con_pipe_read : con_read; |
| 1340 | |||
| 1341 | #ifndef XCOM_WITHOUT_OPENSSL | ||
| 1342 | /* No more SSL in this connection. */ | ||
| 1343 | 2348 | if (Network_provider_manager::getInstance().get_running_protocol() == | |
| 1344 |
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4632 | XCOM_PROTOCOL && |
| 1345 |
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|
2284 | ep->rfd.ssl_fd) { |
| 1346 | ✗ | TASK_CALL(local_server_shutdown_ssl(&ep->rfd, ep->buf, 1024, | |
| 1347 | &ep->ssl_shutdown_ret)); | ||
| 1348 | ✗ | if (ep->ssl_shutdown_ret != 1) { | |
| 1349 | ✗ | G_ERROR( | |
| 1350 | "Error shutting down SSL on XCom's signalling connection on the " | ||
| 1351 | "server side."); | ||
| 1352 | ✗ | TERMINATE; | |
| 1353 | } | ||
| 1354 | } | ||
| 1355 | #endif | ||
| 1356 | |||
| 1357 |
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108402 | while (!xcom_shutdown) { |
| 1358 | /* Wait for signal that there is work to consume from the queue. */ | ||
| 1359 |
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108402 | if (!ep->signaling_connection_error) { |
| 1360 |
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|
322572 | TASK_CALL( |
| 1361 | task_read(&ep->rfd, ep->buf, 1024, &ep->nr_read, ep->signal_read)); | ||
| 1362 |
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|
106054 | if (ep->nr_read == 0) { |
| 1363 | /* purecov: begin inspected */ | ||
| 1364 | ✗ | G_WARNING("local_server: client closed the signalling connection?"); | |
| 1365 | ✗ | ep->signaling_connection_error = true; | |
| 1366 | /* purecov: end */ | ||
| 1367 |
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106054 | } else if (ep->nr_read < 0) { |
| 1368 | /* purecov: begin inspected */ | ||
| 1369 | IFDBG(D_NONE, FN; NDBG64(ep->nr_read)); | ||
| 1370 | ✗ | G_WARNING( | |
| 1371 | "local_server: error reading from the signalling connection?"); | ||
| 1372 | ✗ | ep->signaling_connection_error = true; | |
| 1373 | /* purecov: end */ | ||
| 1374 | } | ||
| 1375 | } | ||
| 1376 | |||
| 1377 | /** | ||
| 1378 | * If an error occurs or if the client connection for the local server is | ||
| 1379 | * forcefully shutdown, we continue processing the queue until the end | ||
| 1380 | * resorting to time-based waits. | ||
| 1381 | */ | ||
| 1382 |
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106054 | if (ep->signaling_connection_error) { |
| 1383 | ✗ | TASK_DELAY(0.1); | |
| 1384 | } | ||
| 1385 | |||
| 1386 | /* Pop, dispatch, and reply. */ | ||
| 1387 | 106054 | ep->request = xcom_try_pop_from_input_cb(); | |
| 1388 |
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212414 | while (ep->request != nullptr) { |
| 1389 | /* Take ownership of the tail of the list, otherwise we lose it when we | ||
| 1390 | free ep->request. */ | ||
| 1391 | 106360 | ep->next_request = xcom_input_request_extract_next(ep->request); | |
| 1392 | 106360 | unchecked_replace_pax_msg(&ep->request_pax_msg, | |
| 1393 | pax_msg_new_0(null_synode)); | ||
| 1394 |
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|
106360 | assert(ep->request_pax_msg->refcnt == 1); |
| 1395 | 106360 | ep->request_pax_msg->op = client_msg; | |
| 1396 | |||
| 1397 | /* Take ownership of the request's app_data, otherwise the app_data is | ||
| 1398 | freed with ep->request. */ | ||
| 1399 | 106360 | ep->request_pax_msg->a = xcom_input_request_extract_app_data(ep->request); | |
| 1400 | 106360 | ep->request_pax_msg->to = VOID_NODE_NO; | |
| 1401 | 106360 | ep->request_pax_msg->force_delivery = | |
| 1402 | 106360 | (ep->request_pax_msg->a->body.c_t == force_config_type); | |
| 1403 | 106360 | dispatch_op(nullptr, ep->request_pax_msg, &ep->internal_reply_queue); | |
| 1404 |
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|
106360 | if (!link_empty(&ep->internal_reply_queue)) { |
| 1405 | 2529 | ep->internal_reply = | |
| 1406 | 2529 | (msg_link *)(link_extract_first(&ep->internal_reply_queue)); | |
| 1407 |
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2529 | assert(ep->internal_reply->p); |
| 1408 |
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2529 | assert(ep->internal_reply->p->refcnt == 1); |
| 1409 | /* We are going to take ownership of the pax_msg which has the reply | ||
| 1410 | payload, so we bump its reference count so that it is not freed by | ||
| 1411 | msg_link_delete. */ | ||
| 1412 | 2529 | ep->reply_payload = ep->internal_reply->p; | |
| 1413 | 2529 | ep->reply_payload->refcnt++; | |
| 1414 | 2529 | msg_link_delete(&ep->internal_reply); | |
| 1415 | /* There should only have been one reply. */ | ||
| 1416 |
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|
2529 | assert(link_empty(&ep->internal_reply_queue)); |
| 1417 | } else { | ||
| 1418 | 103831 | ep->reply_payload = nullptr; | |
| 1419 | } | ||
| 1420 | /* Reply to the request. */ | ||
| 1421 | 106360 | xcom_input_request_reply(ep->request, ep->reply_payload); | |
| 1422 | 106360 | xcom_input_request_free(ep->request); | |
| 1423 | 106360 | ep->request = ep->next_request; | |
| 1424 | } | ||
| 1425 | } | ||
| 1426 | ✗ | FINALLY | |
| 1427 | IFDBG(D_BUG, FN; STRLIT(" shutdown "); NDBG(ep->rfd.fd, d); | ||
| 1428 | NDBG(task_now(), f)); | ||
| 1429 | /* Close the signalling connection. */ | ||
| 1430 |
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2348 | if (!ep->signaling_connection_error) { |
| 1431 |
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2348 | if (input_signal_connection_pipe != nullptr && |
| 1432 |
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2348 | ep->rfd.fd != -1) { // We add -1 here, because in rare cases, the task |
| 1433 | // might have not been activated. Thus, it might | ||
| 1434 | // not have a reference to the socket to close. | ||
| 1435 | 2341 | close(ep->rfd.fd); | |
| 1436 | 2341 | remove_and_wakeup(ep->rfd.fd); | |
| 1437 | } else { | ||
| 1438 | 7 | shutdown_connection(&ep->rfd); | |
| 1439 | } | ||
| 1440 | } | ||
| 1441 | |||
| 1442 | 2348 | unchecked_replace_pax_msg(&ep->request_pax_msg, nullptr); | |
| 1443 | IFDBG(D_NONE, FN; NDBG(xcom_shutdown, d)); | ||
| 1444 |
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|
2348 | TASK_END; |
| 1445 | } | ||
| 1446 | |||
| 1447 | 2355 | static bool_t local_server_is_setup() { | |
| 1448 | 2355 | return xcom_try_pop_from_input_cb != nullptr; | |
| 1449 | } | ||
| 1450 | |||
| 1451 | static void init_time_queue(); | ||
| 1452 | static int paxos_timer_task(task_arg arg [[maybe_unused]]); | ||
| 1453 | |||
| 1454 | 2362 | int xcom_taskmain2(xcom_port listen_port) { | |
| 1455 | 2362 | init_xcom_transport(listen_port); | |
| 1456 | |||
| 1457 | IFDBG(D_BUG, FN; STRLIT("enter taskmain")); | ||
| 1458 | 2362 | ignoresig(SIGPIPE); | |
| 1459 | |||
| 1460 | { | ||
| 1461 | 2362 | result tcp_fd = {0, 0}; | |
| 1462 | |||
| 1463 | /* | ||
| 1464 | Setup networking | ||
| 1465 | */ | ||
| 1466 |
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2362 | auto &net_manager = Network_provider_manager::getInstance(); |
| 1467 | bool error_starting_network_provider = | ||
| 1468 |
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2362 | net_manager.start_active_network_provider(); |
| 1469 |
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|
2362 | if (error_starting_network_provider) { |
| 1470 | /* purecov: begin inspected */ | ||
| 1471 |
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7 | g_critical("Unable to start %s Network Provider", |
| 1472 | Communication_stack_to_string::to_string( | ||
| 1473 | net_manager.get_running_protocol())); | ||
| 1474 |
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7 | if (xcom_comms_cb) { |
| 1475 |
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7 | xcom_comms_cb(XCOM_COMMS_ERROR); |
| 1476 | } | ||
| 1477 |
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7 | if (xcom_terminate_cb) { |
| 1478 | ✗ | xcom_terminate_cb(0); | |
| 1479 | } | ||
| 1480 | 7 | goto cleanup; | |
| 1481 | /* purecov: end */ | ||
| 1482 | } | ||
| 1483 | |||
| 1484 | // We will use POSIX pipes for local queue signaling if we are not using WIN32 | ||
| 1485 | #if !defined(_WIN32) | ||
| 1486 |
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2355 | if (local_server_is_setup()) { |
| 1487 | /* Launch local_server task to handle this connection. */ | ||
| 1488 | { | ||
| 1489 |
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2355 | if (pipe(pipe_signal_connections) == -1) { |
| 1490 | /* purecov: begin inspected */ | ||
| 1491 | ✗ | g_critical("Unable to start local signaling mechanism"); | |
| 1492 | ✗ | if (xcom_comms_cb) { | |
| 1493 | ✗ | xcom_comms_cb(XCOM_COMMS_ERROR); | |
| 1494 | } | ||
| 1495 | ✗ | if (xcom_terminate_cb) { | |
| 1496 | ✗ | xcom_terminate_cb(0); | |
| 1497 | } | ||
| 1498 | ✗ | goto cleanup; | |
| 1499 | /* purecov: end */ | ||
| 1500 | } | ||
| 1501 |
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|
2355 | unblock_fd(pipe_signal_connections[0]); |
| 1502 | |||
| 1503 | /* | ||
| 1504 | Create the read side of input_signal_connection_pipe and create the | ||
| 1505 | local_server. | ||
| 1506 | |||
| 1507 | If one would to use regular sockets, this code is not executed and | ||
| 1508 | the local_server is created in the dispatch_op function. | ||
| 1509 | */ | ||
| 1510 | 2355 | input_signal_connection_pipe = | |
| 1511 | 2355 | (connection_descriptor *)malloc(sizeof(connection_descriptor)); | |
| 1512 | 2355 | input_signal_connection_pipe->fd = pipe_signal_connections[0]; | |
| 1513 | #ifndef XCOM_WITHOUT_OPENSSL | ||
| 1514 | 2355 | input_signal_connection_pipe->ssl_fd = nullptr; | |
| 1515 | #endif | ||
| 1516 | 2355 | set_connected(input_signal_connection_pipe, CON_FD); | |
| 1517 |
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2355 | task_new(local_server, void_arg(input_signal_connection_pipe), |
| 1518 | "local_server", XCOM_THREAD_DEBUG); | ||
| 1519 | } | ||
| 1520 | } | ||
| 1521 | #endif | ||
| 1522 | |||
| 1523 |
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2355 | if (xcom_comms_cb) { |
| 1524 |
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|
2355 | xcom_comms_cb(XCOM_COMMS_OK); |
| 1525 | } | ||
| 1526 | |||
| 1527 | IFDBG(D_NONE, FN; STRLIT("Creating tasks")); | ||
| 1528 | |||
| 1529 |
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2355 | task_new(incoming_connection_task, int_arg(tcp_fd.val), "tcp_server", |
| 1530 | XCOM_THREAD_DEBUG); | ||
| 1531 |
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2355 | task_new(tcp_reaper_task, null_arg, "tcp_reaper_task", XCOM_THREAD_DEBUG); |
| 1532 | #if defined(_WIN32) | ||
| 1533 | task_new(tcp_reconnection_task, null_arg, "tcp_reconnection_task", | ||
| 1534 | XCOM_THREAD_DEBUG); | ||
| 1535 | #endif | ||
| 1536 | |||
| 1537 | 2355 | init_time_queue(); | |
| 1538 |
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2355 | task_new(paxos_timer_task, null_arg, "paxos_timer_task", XCOM_THREAD_DEBUG); |
| 1539 | IFDBG(D_BUG, FN; STRLIT("XCOM is listening on "); NPUT(listen_port, d)); | ||
| 1540 | } | ||
| 1541 | |||
| 1542 | #ifdef XCOM_STANDALONE | ||
| 1543 | if (recovery_init_cb) recovery_init_cb(); | ||
| 1544 | |||
| 1545 | if (recovery_begin_cb) recovery_begin_cb(); | ||
| 1546 | #endif | ||
| 1547 | |||
| 1548 | 2355 | task_loop(); | |
| 1549 | 2355 | cleanup: | |
| 1550 | |||
| 1551 | #ifdef TASK_EVENT_TRACE | ||
| 1552 | dump_task_events(); | ||
| 1553 | #endif | ||
| 1554 | // STOP NETWORK PROVIDERS | ||
| 1555 | 2355 | Network_provider_manager::getInstance().stop_all_network_providers(); | |
| 1556 | |||
| 1557 | 2355 | xcom_thread_deinit(); | |
| 1558 | |||
| 1559 | IFDBG(D_BUG, FN; STRLIT(" exit "); NDBG(xcom_dbg_stack_top, d); | ||
| 1560 | NDBG((unsigned)xcom_debug_mask, x)); | ||
| 1561 | 2355 | xcom_debug_mask = 0; | |
| 1562 | 2355 | xcom_dbg_stack_top = 0; | |
| 1563 |
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|
2355 | if (input_signal_connection_pipe != nullptr) { |
| 1564 | 2348 | ::xcom_input_free_signal_connection(); | |
| 1565 | |||
| 1566 | 2348 | free(input_signal_connection_pipe); | |
| 1567 | 2348 | input_signal_connection_pipe = nullptr; | |
| 1568 | |||
| 1569 | 2348 | pipe_signal_connections[0] = -1; | |
| 1570 | 2348 | pipe_signal_connections[1] = -1; | |
| 1571 | } | ||
| 1572 | |||
| 1573 |
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|
2355 | if (xcom_exit_cb) { |
| 1574 | 2355 | xcom_exit_cb(0); | |
| 1575 | } | ||
| 1576 | |||
| 1577 | 2355 | return 1; | |
| 1578 | } | ||
| 1579 | |||
| 1580 | /* Paxos message construction and sending */ | ||
| 1581 | |||
| 1582 | /* Initialize a message for sending */ | ||
| 1583 | 633427 | static void prepare(pax_msg *p, pax_op op) { | |
| 1584 | 633427 | p->op = op; | |
| 1585 | 633427 | p->reply_to = p->proposal; | |
| 1586 | 633427 | } | |
| 1587 | |||
| 1588 | /* Initialize a prepare_msg */ | ||
| 1589 | 48228 | void init_prepare_msg(pax_msg *p) { prepare(p, prepare_op); } | |
| 1590 | |||
| 1591 | 25372 | static int prepare_msg(pax_msg *p) { | |
| 1592 | 25372 | init_prepare_msg(p); | |
| 1593 | /* p->msg_type = normal; */ | ||
| 1594 | 25372 | return send_to_acceptors(p, "prepare_msg"); | |
| 1595 | } | ||
| 1596 | |||
| 1597 | /* Initialize a noop_msg */ | ||
| 1598 | 22853 | pax_msg *create_noop(pax_msg *p) { | |
| 1599 | 22853 | init_prepare_msg(p); | |
| 1600 | 22853 | p->msg_type = no_op; | |
| 1601 | 22853 | return p; | |
| 1602 | } | ||
| 1603 | |||
| 1604 | /* Initialize a read_msg */ | ||
| 1605 | 425940 | static pax_msg *create_read(site_def const *site, pax_msg *p) { | |
| 1606 | 425940 | p->msg_type = normal; | |
| 1607 | 425940 | p->proposal.node = get_nodeno(site); | |
| 1608 | 425940 | prepare(p, read_op); | |
| 1609 | 425940 | return p; | |
| 1610 | } | ||
| 1611 | |||
| 1612 | 159259 | static int skip_msg(pax_msg *p) { | |
| 1613 | 159259 | prepare(p, skip_op); | |
| 1614 | IFDBG(D_NONE, FN; STRLIT("skipping message "); SYCEXP(p->synode)); | ||
| 1615 | 159259 | p->msg_type = no_op; | |
| 1616 | 159259 | return send_to_all(p, "skip_msg"); | |
| 1617 | } | ||
| 1618 | |||
| 1619 | 130523 | static void brand_app_data(pax_msg *p) { | |
| 1620 | 130523 | app_data_ptr a = p->a; | |
| 1621 |
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242742 | while (a) { |
| 1622 | 112219 | a->app_key = p->synode; | |
| 1623 | 112219 | a->group_id = p->synode.group_id; | |
| 1624 | IFDBG(D_NONE, FN; PTREXP(a); SYCEXP(p->synode); SYCEXP(a->app_key)); | ||
| 1625 | 112219 | a = a->next; | |
| 1626 | } | ||
| 1627 | 130523 | } | |
| 1628 | |||
| 1629 | 109902 | static synode_no my_unique_id(synode_no synode) { | |
| 1630 |
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|
109902 | assert(my_id != 0); |
| 1631 | 109902 | site_def const *site = find_site_def(synode); | |
| 1632 | /* Random number derived from node number and timestamp which uniquely defines | ||
| 1633 | * this instance */ | ||
| 1634 | 109902 | synode.group_id = my_id; | |
| 1635 | 109902 | synode.node = get_nodeno(site); | |
| 1636 | 109902 | return synode; | |
| 1637 | } | ||
| 1638 | |||
| 1639 | 109902 | static void set_unique_id(pax_msg *msg, synode_no synode) { | |
| 1640 | 109902 | app_data_ptr a = msg->a; | |
| 1641 |
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220944 | while (a) { |
| 1642 | 111042 | a->unique_id = synode; | |
| 1643 | 111042 | a = a->next; | |
| 1644 | } | ||
| 1645 | 109902 | } | |
| 1646 | |||
| 1647 | 130523 | void init_propose_msg(pax_msg *p) { | |
| 1648 | 130523 | p->op = accept_op; | |
| 1649 | 130523 | p->reply_to = p->proposal; | |
| 1650 | 130523 | brand_app_data(p); | |
| 1651 | /* set_unique_id(p, my_unique_id(synode)); */ | ||
| 1652 | 130523 | } | |
| 1653 | |||
| 1654 | 120285 | static int send_propose_msg(pax_msg *p) { | |
| 1655 | 120285 | return send_to_acceptors(p, "propose_msg"); | |
| 1656 | } | ||
| 1657 | |||
| 1658 | 109825 | static int propose_msg(pax_msg *p) { | |
| 1659 | 109825 | init_propose_msg(p); | |
| 1660 | 109825 | return send_propose_msg(p); | |
| 1661 | } | ||
| 1662 | |||
| 1663 | 119859 | static void set_learn_type(pax_msg *p) { | |
| 1664 | 119859 | p->op = learn_op; | |
| 1665 | 119859 | p->msg_type = p->a ? normal : no_op; | |
| 1666 | 119859 | } | |
| 1667 | |||
| 1668 | /* purecov: begin deadcode */ | ||
| 1669 | ✗ | static void init_learn_msg(pax_msg *p) { | |
| 1670 | ✗ | set_learn_type(p); | |
| 1671 | ✗ | p->reply_to = p->proposal; | |
| 1672 | } | ||
| 1673 | |||
| 1674 | ✗ | static int send_learn_msg(site_def const *site, pax_msg *p) { | |
| 1675 | IFDBG(D_NONE, FN; dbg_bitset(p->receivers, get_maxnodes(site));); | ||
| 1676 | ✗ | return send_to_all_site(site, p, "learn_msg"); | |
| 1677 | } | ||
| 1678 | /* purecov: end */ | ||
| 1679 | |||
| 1680 | 118274 | static pax_msg *create_tiny_learn_msg(pax_machine *pm, pax_msg *p) { | |
| 1681 | 118274 | pax_msg *tiny_learn_msg = clone_pax_msg_no_app(p); | |
| 1682 | |||
| 1683 | 118274 | ref_msg(tiny_learn_msg); | |
| 1684 | 118274 | tiny_learn_msg->msg_type = p->a ? normal : no_op; | |
| 1685 | 118274 | tiny_learn_msg->op = tiny_learn_op; | |
| 1686 | 118274 | tiny_learn_msg->reply_to = pm->proposer.bal; | |
| 1687 | |||
| 1688 | 118274 | return tiny_learn_msg; | |
| 1689 | } | ||
| 1690 | |||
| 1691 | 118268 | static int send_tiny_learn_msg(site_def const *site, pax_msg *p) { | |
| 1692 | 118268 | int retval = send_to_all_site(site, p, "tiny_learn_msg"); | |
| 1693 | 118268 | unref_msg(&p); | |
| 1694 | 118268 | return retval; | |
| 1695 | } | ||
| 1696 | |||
| 1697 | /* Proposer task */ | ||
| 1698 | |||
| 1699 | 25375 | void prepare_push_3p(site_def const *site, pax_machine *p, pax_msg *msg, | |
| 1700 | synode_no msgno, pax_msg_type msg_type) { | ||
| 1701 | IFDBG(D_NONE, FN; SYCEXP(msgno); NDBG(p->proposer.bal.cnt, d); | ||
| 1702 | NDBG(p->acceptor.promise.cnt, d)); | ||
| 1703 | 25375 | BIT_ZERO(p->proposer.prep_nodeset); | |
| 1704 | 25375 | p->proposer.bal.node = get_nodeno(site); | |
| 1705 | { | ||
| 1706 |
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25375 | int maxcnt = MAX(p->proposer.bal.cnt, p->acceptor.promise.cnt); |
| 1707 | 25375 | p->proposer.bal.cnt = ++maxcnt; | |
| 1708 | } | ||
| 1709 | 25375 | msg->synode = msgno; | |
| 1710 | 25375 | msg->proposal = p->proposer.bal; | |
| 1711 | 25375 | msg->msg_type = msg_type; | |
| 1712 | 25375 | msg->force_delivery = p->force_delivery; | |
| 1713 | 25375 | } | |
| 1714 | |||
| 1715 | 109828 | void prepare_push_2p(site_def const *site, pax_machine *p) { | |
| 1716 |
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109828 | assert(p->proposer.msg); |
| 1717 | |||
| 1718 | 109828 | BIT_ZERO(p->proposer.prop_nodeset); | |
| 1719 | IFDBG(D_NONE, FN; SYCEXP(p->synode)); | ||
| 1720 | 109828 | p->proposer.bal.cnt = 0; | |
| 1721 | 109828 | p->proposer.bal.node = get_nodeno(site); | |
| 1722 | 109828 | p->proposer.msg->proposal = p->proposer.bal; | |
| 1723 | 109828 | p->proposer.msg->synode = p->synode; | |
| 1724 | 109828 | p->proposer.msg->force_delivery = p->force_delivery; | |
| 1725 | 109828 | } | |
| 1726 | |||
| 1727 | 109825 | static void push_msg_2p(site_def const *site, pax_machine *p) { | |
| 1728 | 109825 | prepare_push_2p(site, p); | |
| 1729 | 109825 | propose_msg(p->proposer.msg); | |
| 1730 | 109825 | } | |
| 1731 | |||
| 1732 | 25372 | static void push_msg_3p(site_def const *site, pax_machine *p, pax_msg *msg, | |
| 1733 | synode_no msgno, pax_msg_type msg_type) { | ||
| 1734 |
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25372 | if (wait_forced_config) { |
| 1735 | 537 | force_pax_machine(p, 1); | |
| 1736 | } | ||
| 1737 | |||
| 1738 |
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25372 | assert(msgno.msgno != 0); |
| 1739 | 25372 | prepare_push_3p(site, p, msg, msgno, msg_type); | |
| 1740 |
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25372 | assert(p->proposer.msg); |
| 1741 | 25372 | prepare_msg(msg); | |
| 1742 | IFDBG(D_NONE, FN; BALCEXP(msg->proposal); SYCEXP(msgno); STRLIT(" op "); | ||
| 1743 | STRLIT(pax_op_to_str(msg->op))); | ||
| 1744 | 25372 | } | |
| 1745 | |||
| 1746 | /* Brand client message with unique ID */ | ||
| 1747 | 109902 | static void brand_client_msg(pax_msg *msg, synode_no msgno) { | |
| 1748 |
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109902 | assert(!synode_eq(msgno, null_synode)); |
| 1749 | 109902 | set_unique_id(msg, my_unique_id(msgno)); | |
| 1750 | 109902 | } | |
| 1751 | |||
| 1752 | 6348 | void xcom_send(app_data_ptr a, pax_msg *msg) { | |
| 1753 | IFDBG(D_NONE, FN; PTREXP(a); SYCEXP(a->app_key); SYCEXP(msg->synode)); | ||
| 1754 | 6348 | msg->a = a; | |
| 1755 | 6348 | msg->op = client_msg; | |
| 1756 | { | ||
| 1757 | 6348 | msg_link *link = msg_link_new(msg, VOID_NODE_NO); | |
| 1758 | IFDBG(D_NONE, FN; COPY_AND_FREE_GOUT(dbg_pax_msg(msg))); | ||
| 1759 | 6348 | channel_put(&prop_input_queue, &link->l); | |
| 1760 | } | ||
| 1761 | 6348 | } | |
| 1762 | |||
| 1763 | #define FNVSTART 0x811c9dc5 | ||
| 1764 | |||
| 1765 | /* Fowler-Noll-Vo type multiplicative hash */ | ||
| 1766 | 10191 | static uint32_t fnv_hash(unsigned char *buf, size_t length, uint32_t sum) { | |
| 1767 | 10191 | size_t i = 0; | |
| 1768 |
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1389373 | for (i = 0; i < length; i++) { |
| 1769 | 1379182 | sum = sum * (uint32_t)0x01000193 ^ (uint32_t)buf[i]; | |
| 1770 | } | ||
| 1771 | 10191 | return sum; | |
| 1772 | } | ||
| 1773 | |||
| 1774 | /** | ||
| 1775 | Create a new (hopefully unique) ID. The basic idea is to create a hash from | ||
| 1776 | the host ID and a timestamp. | ||
| 1777 | */ | ||
| 1778 | 3397 | uint32_t new_id() { | |
| 1779 |
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3397 | long id = xcom_unique_long(); |
| 1780 |
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3397 | double timestamp = task_now(); |
| 1781 | 3397 | uint32_t retval = 0; | |
| 1782 |
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10191 | while (retval == 0 || |
| 1783 | 3397 | is_dead_site(retval)) { /* Avoid returning 0 or already used site id */ | |
| 1784 | 3397 | retval = fnv_hash((unsigned char *)&id, sizeof(id), 0); | |
| 1785 | 3397 | retval = fnv_hash((unsigned char *)×tamp, sizeof(timestamp), retval); | |
| 1786 | } | ||
| 1787 | 3397 | return retval; | |
| 1788 | } | ||
| 1789 | |||
| 1790 | 7713 | static synode_no getstart(app_data_ptr a) { | |
| 1791 | 7713 | synode_no retval = null_synode; | |
| 1792 | /* If a->group_id is null_id, we set the group id from app_key.group_id, | ||
| 1793 | * which is hopefully not null_id. If it is, we're out of luck. */ | ||
| 1794 |
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7713 | if (a && a->group_id == null_id) { |
| 1795 | /* purecov: begin deadcode */ | ||
| 1796 | ✗ | a->group_id = a->app_key.group_id; /* app_key may have valid group */ | |
| 1797 | /* purecov: end */ | ||
| 1798 | } | ||
| 1799 |
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7713 | G_DEBUG("pid %d getstart group_id %x", xpid(), a->group_id); |
| 1800 |
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7713 | if (!a || a->group_id == null_id) { |
| 1801 | ✗ | retval.group_id = new_id(); | |
| 1802 | } else { | ||
| 1803 | 7713 | a->app_key.group_id = a->group_id; | |
| 1804 | 7713 | retval = a->app_key; | |
| 1805 |
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14589 | if (get_site_def() && |
| 1806 |
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6876 | retval.msgno > 1) { /* Special case for initial boot of site */ |
| 1807 | /* Not valid until after event horizon has been passed */ | ||
| 1808 | 6012 | retval = add_event_horizon(retval); | |
| 1809 | } | ||
| 1810 | } | ||
| 1811 | 7713 | return retval; | |
| 1812 | } | ||
| 1813 | |||
| 1814 | #ifdef PERMISSIVE_EH_ACTIVE_CONFIG | ||
| 1815 | /* purecov: begin deadcode */ | ||
| 1816 | synode_no get_default_start(app_data_ptr a) { | ||
| 1817 | synode_no retval = null_synode; | ||
| 1818 | /* If a->group_id is null_id, we set the group id from app_key.group_id, | ||
| 1819 | * which is hopefully not null_id. If it is, we're out of luck. */ | ||
| 1820 | if (a && a->group_id == null_id) { | ||
| 1821 | a->group_id = a->app_key.group_id; /* app_key may have valid group */ | ||
| 1822 | } | ||
| 1823 | G_DEBUG("pid %d getstart group_id %x", xpid(), a ? a->group_id : 0); | ||
| 1824 | if (!a || a->group_id == null_id) { | ||
| 1825 | retval.group_id = new_id(); | ||
| 1826 | } else { | ||
| 1827 | a->app_key.group_id = a->group_id; | ||
| 1828 | retval = a->app_key; | ||
| 1829 | if (retval.msgno > 1) { /* Special case for initial boot of site */ | ||
| 1830 | /* Not valid until after event horizon has been passed */ | ||
| 1831 | retval = add_default_event_horizon(retval); | ||
| 1832 | } | ||
| 1833 | } | ||
| 1834 | return retval; | ||
| 1835 | } | ||
| 1836 | /* purecov: end */ | ||
| 1837 | #endif | ||
| 1838 | |||
| 1839 | #if TASK_DBUG_ON | ||
| 1840 | /* purecov: begin deadcode */ | ||
| 1841 | static void dump_xcom_node_names(site_def const *site) { | ||
| 1842 | u_int i; | ||
| 1843 | constexpr const size_t bufsize = NSERVERS * 256; | ||
| 1844 | char buf[bufsize]; /* Big enough */ | ||
| 1845 | char *p = buf; | ||
| 1846 | if (!site) { | ||
| 1847 | G_INFO("pid %d no site", xpid()); | ||
| 1848 | return; | ||
| 1849 | } | ||
| 1850 | *p = 0; | ||
| 1851 | for (i = 0; i < site->nodes.node_list_len; i++) { | ||
| 1852 | p = strncat(p, site->nodes.node_list_val[i].address, bufsize - 1); | ||
| 1853 | p = strncat(p, " ", bufsize - 1); | ||
| 1854 | } | ||
| 1855 | buf[bufsize - 1] = 0; | ||
| 1856 | G_INFO("pid %d node names %s", xpid(), buf); | ||
| 1857 | } | ||
| 1858 | /* purecov: end */ | ||
| 1859 | #endif | ||
| 1860 | |||
| 1861 | 12329 | void site_install_action(site_def *site, cargo_type operation) { | |
| 1862 | IFDBG(D_NONE, FN; NDBG(get_nodeno(get_site_def()), u)); | ||
| 1863 |
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12329 | assert(site->event_horizon); |
| 1864 |
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23806 | if (group_mismatch(site->start, max_synode) || |
| 1865 |
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11477 | synode_gt(site->start, max_synode)) |
| 1866 | 7985 | set_max_synode(site->start); | |
| 1867 | 12329 | site->nodeno = xcom_find_node_index(&site->nodes); | |
| 1868 | 12329 | push_site_def(site); | |
| 1869 | IFDBG(D_NONE, dump_xcom_node_names(site)); | ||
| 1870 | IFDBG(D_BUG, FN; SYCEXP(site->start); SYCEXP(site->boot_key); | ||
| 1871 | NUMEXP(site->max_active_leaders)); | ||
| 1872 | IFDBG(D_BUG, FN; COPY_AND_FREE_GOUT(dbg_site_def(site))); | ||
| 1873 | 12329 | set_group(get_group_id(site)); | |
| 1874 |
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12329 | if (get_maxnodes(get_site_def())) { |
| 1875 | 11456 | update_servers(site, operation); | |
| 1876 | } | ||
| 1877 | 12329 | site->install_time = task_now(); | |
| 1878 |
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12329 | G_INFO( |
| 1879 | "Sucessfully installed new site definition. Start synode for this " | ||
| 1880 | "configuration is " SY_FMT ", boot key synode is " SY_FMT | ||
| 1881 | ", configured event horizon=%" PRIu32 ", my node identifier is %u", | ||
| 1882 | SY_MEM(site->start), SY_MEM(site->boot_key), site->event_horizon, | ||
| 1883 | get_nodeno(site)); | ||
| 1884 | IFDBG(D_NONE, FN; NDBG(get_nodeno(site), u)); | ||
| 1885 | IFDBG(D_NONE, FN; SYCEXP(site->start); SYCEXP(site->boot_key); | ||
| 1886 | NDBG(site->install_time, f)); | ||
| 1887 | IFDBG(D_NONE, FN; NDBG(get_nodeno(site), u)); | ||
| 1888 | ADD_DBG( | ||
| 1889 | D_BASE, add_event(EVENT_DUMP_PAD, string_arg("nodeno")); | ||
| 1890 | add_event(EVENT_DUMP_PAD, uint_arg(get_nodeno(site))); | ||
| 1891 | add_event(EVENT_DUMP_PAD, string_arg("site->boot_key")); | ||
| 1892 | add_synode_event(site->boot_key); | ||
| 1893 | /* add_event(EVENT_DUMP_PAD, uint_arg(chksum_node_list(&site->nodes))); */ | ||
| 1894 | ); | ||
| 1895 | 12329 | } | |
| 1896 | |||
| 1897 | 85 | static void active_leaders(site_def *site, leader_array *leaders) { | |
| 1898 | u_int i; | ||
| 1899 | u_int n; | ||
| 1900 | /* Synthesize leaders by copying all node names of active leaders */ | ||
| 1901 |
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304 | for (i = 0, n = 0; i < site->nodes.node_list_len; i++) { |
| 1902 |
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219 | if (is_active_leader(i, site)) n++; |
| 1903 | } | ||
| 1904 | 85 | leaders->leader_array_len = n; | |
| 1905 |
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85 | if (n) { |
| 1906 | 85 | leaders->leader_array_val = static_cast<leader *>( | |
| 1907 | 85 | xcom_calloc((size_t)leaders->leader_array_len, sizeof(leader))); | |
| 1908 |
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304 | for (i = 0, n = 0; i < site->nodes.node_list_len; i++) { |
| 1909 |
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219 | if (is_active_leader(i, site)) { |
| 1910 | 157 | leaders->leader_array_val[n++].address = | |
| 1911 | 157 | strdup(site->nodes.node_list_val[i].address); | |
| 1912 | } | ||
| 1913 | } | ||
| 1914 | } else { | ||
| 1915 | ✗ | leaders->leader_array_val = nullptr; | |
| 1916 | } | ||
| 1917 | 85 | } | |
| 1918 | |||
| 1919 | 3 | extern "C" void synthesize_leaders(leader_array *leaders) { | |
| 1920 | // Default value meaning 'not set by client ' | ||
| 1921 | 3 | leaders->leader_array_len = 0; | |
| 1922 | 3 | leaders->leader_array_val = nullptr; | |
| 1923 | 3 | } | |
| 1924 | |||
| 1925 | 159 | static bool leaders_set_by_client(site_def const *site) { | |
| 1926 | 159 | return site->leaders.leader_array_len != 0; | |
| 1927 | } | ||
| 1928 | |||
| 1929 | 1731 | static site_def *create_site_def_with_start(app_data_ptr a, synode_no start) { | |
| 1930 | 1731 | site_def *site = new_site_def(); | |
| 1931 | IFDBG(D_NONE, FN; COPY_AND_FREE_GOUT(dbg_list(&a->body.app_u_u.nodes));); | ||
| 1932 | 1731 | init_site_def(a->body.app_u_u.nodes.node_list_len, | |
| 1933 | a->body.app_u_u.nodes.node_list_val, site); | ||
| 1934 | 1731 | site->start = start; | |
| 1935 | 1731 | site->boot_key = a->app_key; | |
| 1936 | |||
| 1937 | // If SINGLE_WRITER_ONLY is defined, ALL configs will be single writer. Used for | ||
| 1938 | // running all tests in single writer mode | ||
| 1939 | #ifdef SINGLE_WRITER_ONLY | ||
| 1940 | site->max_active_leaders = 1; /*Single writer */ | ||
| 1941 | #else | ||
| 1942 | 1731 | site->max_active_leaders = active_leaders_all; /* Set to all nodes*/ | |
| 1943 | #endif | ||
| 1944 | |||
| 1945 | 1731 | return site; | |
| 1946 | } | ||
| 1947 | |||
| 1948 | static xcom_proto constexpr single_writer_support = x_1_9; | ||
| 1949 | |||
| 1950 | 1704 | static site_def *install_ng_with_start(app_data_ptr a, synode_no start) { | |
| 1951 |
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1704 | if (a) { |
| 1952 | 1704 | site_def *site = create_site_def_with_start(a, start); | |
| 1953 | 1704 | site_def const *old_site = get_site_def(); | |
| 1954 | |||
| 1955 | // The reason why we need to recompute node sets and time stamps, is that | ||
| 1956 | // node sets and time stamps are stored in the site_def indexed by node | ||
| 1957 | // number, but they really are related to a specific node, not a specific | ||
| 1958 | // node number. When the site_def changes, the node number of a node may | ||
| 1959 | // change, thus invalidating the mapping from node numbers to node sets and | ||
| 1960 | // timestamps. But given the old and new definition, it is possible to | ||
| 1961 | // remap. | ||
| 1962 |
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1704 | if (old_site && old_site->x_proto >= single_writer_support) { |
| 1963 | 867 | recompute_node_sets(old_site, site); | |
| 1964 | 867 | recompute_timestamps(old_site->detected, &old_site->nodes, site->detected, | |
| 1965 | 867 | &site->nodes); | |
| 1966 | } | ||
| 1967 | 1704 | site_install_action(site, a->body.c_t); | |
| 1968 | 1704 | return site; | |
| 1969 | } | ||
| 1970 | ✗ | return nullptr; | |
| 1971 | } | ||
| 1972 | |||
| 1973 | 1704 | site_def *install_node_group(app_data_ptr a) { | |
| 1974 | ADD_DBG(D_BASE, add_event(EVENT_DUMP_PAD, string_arg("a->app_key")); | ||
| 1975 | add_synode_event(a->app_key);); | ||
| 1976 |
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1704 | if (a) |
| 1977 | 1704 | return install_ng_with_start(a, getstart(a)); | |
| 1978 | else | ||
| 1979 | ✗ | return nullptr; | |
| 1980 | } | ||
| 1981 | |||
| 1982 | 247778 | void set_max_synode(synode_no synode) { | |
| 1983 | 247778 | max_synode = synode; /* Track max synode number */ | |
| 1984 | IFDBG(D_BASE, FN; STRLIT("new "); SYCEXP(max_synode)); | ||
| 1985 | 247778 | activate_sweeper(); | |
| 1986 | 247778 | } | |
| 1987 | |||
| 1988 | 234180 | static int is_busy(synode_no s) { | |
| 1989 | 234180 | pax_machine *p = hash_get(s); | |
| 1990 |
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234180 | if (!p) { |
| 1991 | 77542 | return 0; | |
| 1992 | } else { | ||
| 1993 | 156638 | return started(p); | |
| 1994 | } | ||
| 1995 | } | ||
| 1996 | |||
| 1997 | 109702 | bool_t match_my_msg(pax_msg *learned, pax_msg *mine) { | |
| 1998 | IFDBG(D_NONE, FN; PTREXP(learned->a); | ||
| 1999 | if (learned->a) SYCEXP(learned->a->unique_id); PTREXP(mine->a); | ||
| 2000 | if (mine->a) SYCEXP(mine->a->unique_id);); | ||
| 2001 |
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109702 | if (learned->a && mine->a) { /* Both have app data, see if data is mine */ |
| 2002 | 108386 | return synode_eq(learned->a->unique_id, mine->a->unique_id); | |
| 2003 |
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1316 | } else if (!(learned->a || mine->a)) { /* None have app data, anything goes */ |
| 2004 | ✗ | return TRUE; | |
| 2005 | } else { /* Definitely mismatch */ | ||
| 2006 | 1316 | return FALSE; | |
| 2007 | } | ||
| 2008 | } | ||
| 2009 | |||
| 2010 | /* | ||
| 2011 | * Initialize the log sequence number (lsn). | ||
| 2012 | */ | ||
| 2013 | 5594 | void initialize_lsn(uint64_t n) { lsn = n; } | |
| 2014 | |||
| 2015 | /** | ||
| 2016 | * Assign the next log sequence number (lsn) for a message. | ||
| 2017 | * | ||
| 2018 | * Initial propose sets lsn to msgno of the max message number as safe starting | ||
| 2019 | * point, otherwise lsn shall be ever increasing. lsn ensures sender order known | ||
| 2020 | * on receiver side, as messages may arrive "out of order" due to | ||
| 2021 | * retransmission. We use max_synode instead of current_message to avoid any | ||
| 2022 | * conflict with lsn allocated by a previous instance of the node. | ||
| 2023 | */ | ||
| 2024 | 112104 | static uint64_t assign_lsn() { | |
| 2025 |
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112104 | if (lsn == 0) { |
| 2026 | 2197 | initialize_lsn(max_synode.msgno); | |
| 2027 | } | ||
| 2028 | 112104 | lsn++; | |
| 2029 | IFDBG(D_EXEC, NDBG64(lsn)); | ||
| 2030 | 112104 | return lsn; | |
| 2031 | } | ||
| 2032 | |||
| 2033 | #if TASK_DBUG_ON | ||
| 2034 | /* purecov: begin deadcode */ | ||
| 2035 | static int check_lsn(app_data_ptr a) { | ||
| 2036 | while (a) { | ||
| 2037 | if (!a->lsn) return 0; | ||
| 2038 | a = a->next; | ||
| 2039 | } | ||
| 2040 | return 1; | ||
| 2041 | } | ||
| 2042 | /* purecov: end */ | ||
| 2043 | #endif | ||
| 2044 | |||
| 2045 | static void propose_noop(synode_no find, pax_machine *p); | ||
| 2046 | |||
| 2047 | /** | ||
| 2048 | * Checks if the given synod s is outside the event horizon. | ||
| 2049 | * | ||
| 2050 | * Common case: there are no configurations pending, or if there are, none of | ||
| 2051 | * them reconfigure the event horizon. The common case threshold is: | ||
| 2052 | * | ||
| 2053 | * last_executed_synod + event_horizon(active_config) | ||
| 2054 | * | ||
| 2055 | * | ||
| 2056 | * If an event horizon reconfiguration R is pending, it is possible that it | ||
| 2057 | * reduces the event horizon. In that case, it is possible that the threshold | ||
| 2058 | * above falls outside the new event horizon. | ||
| 2059 | * | ||
| 2060 | * For example, consider last_executed_synod = 42 and | ||
| 2061 | * event_horizon(active_config) = 10. | ||
| 2062 | * At this point this member participates in synods up to 52. | ||
| 2063 | * Now consider an event horizon reconfiguration that takes effect at synod 45, | ||
| 2064 | * which modifies the event horizon to 2. This means that when | ||
| 2065 | * last_executed_synod = 45, event_horizon(active_config) = 2. At this point | ||
| 2066 | * this member should only be able to participate in synods up to 47. The member | ||
| 2067 | * may have previously started processing messages directed to synods between 47 | ||
| 2068 | * and 52, but will now ignore messages directed to those same synods. | ||
| 2069 | * | ||
| 2070 | * We do not want to start processing messages that will eventually fall out | ||
| 2071 | * of the event horizon. More importantly, the threshold above may not be safe | ||
| 2072 | * due to the exit logic of executor_task. | ||
| 2073 | * | ||
| 2074 | * When a node removes itself from the group on configuration C starting at | ||
| 2075 | * synod start(C), the exit logic relies on knowing *when* a majority has | ||
| 2076 | * executed synod start(C) - 1, i.e. the last message of the last configuration | ||
| 2077 | * to contain the leaving node. | ||
| 2078 | * | ||
| 2079 | * With a constant event horizon, we know that when synod | ||
| 2080 | * start(C) + event_horizon is learnt, it is because a majority already executed | ||
| 2081 | * or is ready to execute (and thus learned) synod start(C). This implies that a | ||
| 2082 | * majority already executed start(C) - 1. | ||
| 2083 | * | ||
| 2084 | * With a dynamic event horizon, we cannot be sure that when synod | ||
| 2085 | * start(C) + event_horizon(C) is learnt, a majority already executed or is | ||
| 2086 | * ready to execute synod start(C). | ||
| 2087 | * This is because it is possible for a new, smaller, event horizon to take | ||
| 2088 | * effect between start(C) and start(C) + event_horizon(C). | ||
| 2089 | * If that happens, the threshold above allows nodes to participate in synods | ||
| 2090 | * which are possibly beyond start(C) + event_horizon(C), which can lead to the | ||
| 2091 | * value of synod start(C) + event_horizon(C) being learnt without a majority | ||
| 2092 | * already having executed or being ready to execute synod start(C). | ||
| 2093 | * | ||
| 2094 | * In order to maintain the assumption made by the executor_task's exit logic, | ||
| 2095 | * when an event horizon reconfiguration R is pending we set the threshold to | ||
| 2096 | * the minimum between: | ||
| 2097 | * | ||
| 2098 | * last_executed_synod + event_horizon(active_config) | ||
| 2099 | * | ||
| 2100 | * and: | ||
| 2101 | * | ||
| 2102 | * start(R) - 1 + event_horizon(R) | ||
| 2103 | */ | ||
| 2104 | 1828633 | static uint64_t too_far_threshold(xcom_event_horizon active_event_horizon) { | |
| 2105 | 1828633 | return executed_msg.msgno + active_event_horizon; | |
| 2106 | } | ||
| 2107 | |||
| 2108 | 2610 | static uint64_t too_far_threshold_new_event_horizon_pending( | |
| 2109 | site_def const *new_config) { | ||
| 2110 | 2610 | uint64_t last_executed = executed_msg.msgno; | |
| 2111 | /* compute normal threshold */ | ||
| 2112 | uint64_t possibly_unsafe_threshold; | ||
| 2113 | 2610 | site_def const *active_config = find_site_def(executed_msg); | |
| 2114 | 2610 | xcom_event_horizon active_event_horizon = active_config->event_horizon; | |
| 2115 | 2610 | possibly_unsafe_threshold = last_executed + active_event_horizon; | |
| 2116 | /* compute threshold taking into account new event horizon */ { | ||
| 2117 | uint64_t maximum_safe_threshold; | ||
| 2118 | xcom_event_horizon new_event_horizon; | ||
| 2119 | 2610 | uint64_t start_new_event_horizon = new_config->start.msgno; | |
| 2120 | 2610 | new_event_horizon = new_config->event_horizon; | |
| 2121 | 2610 | maximum_safe_threshold = start_new_event_horizon - 1 + new_event_horizon; | |
| 2122 | /* use the minimum of both for safety */ | ||
| 2123 |
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2610 | return MIN(possibly_unsafe_threshold, maximum_safe_threshold); |
| 2124 | } | ||
| 2125 | } | ||
| 2126 | |||
| 2127 | 1831243 | static inline int too_far(synode_no s) { | |
| 2128 | 1831243 | uint64_t threshold = 0; | |
| 2129 | 1831243 | site_def const *active_config = find_site_def(executed_msg); | |
| 2130 |
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1831243 | if (active_config != nullptr) { |
| 2131 | 1831243 | site_def const *pending_config = first_event_horizon_reconfig(); | |
| 2132 | 1831243 | bool_t const no_event_horizon_reconfig_pending = | |
| 2133 | 1831243 | (pending_config == nullptr); | |
| 2134 |
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1831243 | if (is_latest_config(active_config) || no_event_horizon_reconfig_pending) { |
| 2135 | 1828633 | threshold = too_far_threshold(active_config->event_horizon); | |
| 2136 | } else { | ||
| 2137 | 2610 | threshold = too_far_threshold_new_event_horizon_pending(pending_config); | |
| 2138 | } | ||
| 2139 | } else { | ||
| 2140 | /* we have no configs, resort to default */ | ||
| 2141 | ✗ | threshold = too_far_threshold(EVENT_HORIZON_MIN); | |
| 2142 | } | ||
| 2143 | 1831243 | return s.msgno >= threshold; | |
| 2144 | } | ||
| 2145 | |||
| 2146 | #define GOTO(x) \ | ||
| 2147 | { \ | ||
| 2148 | IFDBG(D_NONE, STRLIT("goto "); STRLIT(#x)); \ | ||
| 2149 | goto x; \ | ||
| 2150 | } | ||
| 2151 | |||
| 2152 | 108767 | static inline int is_view(cargo_type x) { return x == view_msg; } | |
| 2153 | |||
| 2154 | 326688 | static inline int is_config(cargo_type x) { | |
| 2155 |
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325014 | return x == unified_boot_type || x == add_node_type || |
| 2156 |
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315774 | x == remove_node_type || x == set_event_horizon_type || |
| 2157 |
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651702 | x == force_config_type || x == set_max_leaders || |
| 2158 | 326688 | x == set_leaders_type; | |
| 2159 | } | ||
| 2160 | |||
| 2161 | static int wait_for_cache(pax_machine **pm, synode_no synode, double timeout); | ||
| 2162 | static int prop_started = 0; | ||
| 2163 | static int prop_finished = 0; | ||
| 2164 | |||
| 2165 | /* Find a free slot locally. | ||
| 2166 | Note that we will happily increment past the event horizon. | ||
| 2167 | The caller is thus responsible for checking the validity of the | ||
| 2168 | returned value by calling too_far() and ignore_message(). */ | ||
| 2169 | 110264 | static synode_no local_synode_allocator(synode_no synode) { | |
| 2170 |
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110264 | assert(!synode_eq(synode, null_synode)); |
| 2171 | |||
| 2172 | // Ensure node number of synode is ours, whilst also ensuring that the synode | ||
| 2173 | // is monotonically increasing | ||
| 2174 | 110264 | node_no const my_nodeno = get_nodeno(find_site_def(synode)); | |
| 2175 |
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110264 | if (my_nodeno >= synode.node) { |
| 2176 | 95484 | synode.node = my_nodeno; | |
| 2177 | } else { | ||
| 2178 | 14780 | synode = incr_msgno(synode); | |
| 2179 | } | ||
| 2180 | |||
| 2181 |
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123928 | while (is_busy(synode)) { |
| 2182 | 13664 | synode = incr_msgno(synode); | |
| 2183 | } | ||
| 2184 |
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110264 | assert(!synode_eq(synode, null_synode)); |
| 2185 | 110264 | return synode; | |
| 2186 | } | ||
| 2187 | |||
| 2188 | /* Find a likely free slot globally. | ||
| 2189 | Note that we will happily increment past the event horizon. | ||
| 2190 | The caller is thus responsible for checking the validity of the | ||
| 2191 | returned value by calling too_far() and ignore_message(). | ||
| 2192 | The test for ignore_message() here is only valid until the | ||
| 2193 | event horizon. */ | ||
| 2194 | ✗ | static synode_no global_synode_allocator(site_def *site, synode_no synode) { | |
| 2195 | ✗ | assert(!synode_eq(synode, null_synode)); | |
| 2196 | |||
| 2197 | ✗ | while (ignore_message(synode, site, "global_synode_allocator")) { | |
| 2198 | ✗ | synode = incr_synode(synode); | |
| 2199 | } | ||
| 2200 | ✗ | assert(!synode_eq(synode, null_synode)); | |
| 2201 | ✗ | return synode; | |
| 2202 | } | ||
| 2203 | |||
| 2204 | /* Find a free slot on remote leader */ | ||
| 2205 | 48231 | static node_no remote_synode_allocator(site_def *site, app_data const &a) { | |
| 2206 | static node_no distributor = 0; // Distribute requests equally among leaders | ||
| 2207 | 48231 | node_no maxnodes = get_maxnodes(site); | |
| 2208 | 48231 | distributor = distributor % maxnodes; // Rescale in case site has changed | |
| 2209 | 48231 | node_no i = distributor; | |
| 2210 | // Ensure that current_message is associated with site | ||
| 2211 |
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48231 | if (synode_lt(current_message, site->start)) { |
| 2212 | 20 | current_message = site->start; | |
| 2213 | } | ||
| 2214 | for (;;) { | ||
| 2215 |
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97723 | if (is_active_leader(i, site) && |
| 2216 |
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48745 | !may_be_dead(site->detected, i, |
| 2217 | task_now())) { // Found leader, send request | ||
| 2218 | pax_msg *p = | ||
| 2219 | 47629 | pax_msg_new(current_message, site); // Message number does not matter | |
| 2220 | IFDBG(D_CONS, FN; STRLIT("sending request "); NUMEXP(i); | ||
| 2221 | SYCEXP(current_message)); | ||
| 2222 | 47629 | p->op = synode_request; | |
| 2223 | 47629 | send_server_msg(site, i, p); | |
| 2224 | 47629 | distributor = (i + 1) % maxnodes; | |
| 2225 | 47629 | return i; | |
| 2226 | } | ||
| 2227 | 1349 | i = (i + 1) % maxnodes; | |
| 2228 |
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1349 | if (i == distributor) { |
| 2229 | /* There are no leaders, see if we should become leader. Note the special | ||
| 2230 | case for `force_config_type`. If we are in a network partition | ||
| 2231 | situation that must be healed using `force_config_type`, the leader | ||
| 2232 | might not be available and we might not be `iamthegreatest`. If we are | ||
| 2233 | the one tasked with `force_config_type` the entire system is relying on | ||
| 2234 | us to get consensus on `force_config_type` to unblock the group. | ||
| 2235 | Therefore, we self-allocate a synod for `force_config_type` to ensure | ||
| 2236 | the system makes progress. */ | ||
| 2237 |
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602 | if (iamthegreatest(site) || a.body.c_t == force_config_type) { |
| 2238 | // Grab message number and answer to self | ||
| 2239 | ✗ | synode_no synode = global_synode_allocator(site, current_message); | |
| 2240 | ✗ | if (!too_far(synode)) { | |
| 2241 | // We will grab this number, advance current_message | ||
| 2242 | ✗ | set_current_message(incr_synode(synode)); | |
| 2243 | IFDBG(D_CONS, FN; STRLIT("grab message "); SYCEXP(synode); | ||
| 2244 | SYCEXP(current_message)); | ||
| 2245 | ✗ | synode_number_pool.put(synode, synode_allocation_type::global); | |
| 2246 | } | ||
| 2247 | } | ||
| 2248 | 602 | return get_nodeno(site); | |
| 2249 | } | ||
| 2250 | 747 | } | |
| 2251 | } | ||
| 2252 | |||
| 2253 | #ifdef DELIVERY_TIMEOUT | ||
| 2254 | static bool check_delivery_timeout(site_def *site, double start_propose, | ||
| 2255 | app_data *a) { | ||
| 2256 | bool retval = | ||
| 2257 | (start_propose + a->expiry_time) < task_now() && !enough_live_nodes(site); | ||
| 2258 | if (retval) { | ||
| 2259 | DBGOUT_ASSERT(check_lsn(a), STRLIT("NULL lsn")); | ||
| 2260 | IFDBG(D_NONE, FN; STRLIT("timeout -> delivery_failure")); | ||
| 2261 | deliver_to_app(NULL, a, delivery_failure); | ||
| 2262 | } | ||
| 2263 | return retval; | ||
| 2264 | } | ||
| 2265 | #endif | ||
| 2266 | |||
| 2267 | 186478 | static int reserve_synode_number(synode_allocation_type *synode_allocation, | |
| 2268 | site_def **site, synode_no *msgno, | ||
| 2269 | int *remote_retry, app_data *a, | ||
| 2270 | synode_reservation_status *ret) { | ||
| 2271 | 186478 | *ret = synode_reservation_status::number_ok; // Optimistic, will be reset if | |
| 2272 | // necessary | ||
| 2273 | DECL_ENV | ||
| 2274 | int dummy; | ||
| 2275 | 113420 | ENV_INIT | |
| 2276 | 113420 | END_ENV_INIT | |
| 2277 | END_ENV; | ||
| 2278 | |||
| 2279 |
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186478 | TASK_BEGIN |
| 2280 | do { | ||
| 2281 | 113432 | *synode_allocation = synode_allocation_type::todo; | |
| 2282 | IFDBG(D_CONS, FN; SYCEXP(current_message)); | ||
| 2283 | 113432 | *site = find_site_def_rw(current_message); | |
| 2284 |
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113432 | if (is_leader(*site)) { // Use local synode allocator |
| 2285 | 109808 | *msgno = local_synode_allocator(current_message); | |
| 2286 | IFDBG(D_CONS, FN; SYCEXP(outer_ep->msgno)); | ||
| 2287 | 109808 | *synode_allocation = synode_allocation_type::local; | |
| 2288 | } else { // Cannot use local, try remote | ||
| 2289 | // Get synode number from another leader | ||
| 2290 | 3624 | *remote_retry = 0; | |
| 2291 |
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48687 | while (synode_number_pool.empty()) { |
| 2292 | // get_maxnodes(get_site_def()) > 0 is a precondition for | ||
| 2293 | // `remote_synode_allocator`. | ||
| 2294 |
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48231 | if (get_maxnodes(get_site_def()) == 0) { |
| 2295 | ✗ | TASK_DELAY(0.1); | |
| 2296 | ✗ | TASK_RETURN(synode_reservation_status::no_nodes); | |
| 2297 | } | ||
| 2298 | #if TASK_DBUG_ON | ||
| 2299 | node_no allocator_node = | ||
| 2300 | #endif | ||
| 2301 | 48231 | remote_synode_allocator(get_site_def_rw(), | |
| 2302 | *a); // Send request for synode, use | ||
| 2303 | // latest config | ||
| 2304 | 48231 | if (*remote_retry > 10) { | |
| 2305 | IFDBG(D_BUG, FN; NUMEXP(outer_ep->self); NUMEXP(allocator_node); | ||
| 2306 | SYCEXP(executed_msg); SYCEXP(current_message); | ||
| 2307 | SYCEXP(outer_ep->msgno); SYCEXP(get_site_def_rw()->start)); | ||
| 2308 | } | ||
| 2309 |
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48231 | if (synode_number_pool.empty()) { // Only wait if still empty |
| 2310 |
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96462 | TIMED_TASK_WAIT(&synode_number_pool.queue, |
| 2311 | 0.1); // Wait for incoming synode | ||
| 2312 | } | ||
| 2313 | 45063 | (*remote_retry)++; | |
| 2314 | } | ||
| 2315 | 456 | std::tie(*msgno, *synode_allocation) = synode_number_pool.get(); | |
| 2316 | IFDBG(D_CONS, FN; SYCEXP(outer_ep->msgno)); | ||
| 2317 | } | ||
| 2318 | |||
| 2319 | // Update site to match synode | ||
| 2320 | 110264 | *site = proposer_site = find_site_def_rw(*msgno); | |
| 2321 | |||
| 2322 | // Set the global current message for all number allocators | ||
| 2323 | 110264 | set_current_message(incr_synode(*msgno)); | |
| 2324 | |||
| 2325 |
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135079 | while (too_far(*msgno)) { /* Too far ahead of executor */ |
| 2326 |
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49654 | TIMED_TASK_WAIT(&exec_wait, 0.2); |
| 2327 | IFDBG(D_NONE, FN; SYCEXP(ep->msgno); TIMECEXP(ep->start_propose); | ||
| 2328 | TIMECEXP(outer_ep->client_msg->p->a->expiry_time); | ||
| 2329 | TIMECEXP(task_now()); NDBG(enough_live_nodes(outer_ep->site), d)); | ||
| 2330 | #ifdef DELIVERY_TIMEOUT | ||
| 2331 | if (check_delivery_timeout(outer_ep->site, outer_ep->start_propose, | ||
| 2332 | outer_ep->client_msg->p->a)) { | ||
| 2333 | TASK_RETURN(delivery_timeout); | ||
| 2334 | } | ||
| 2335 | #endif | ||
| 2336 | } | ||
| 2337 | // Filter out busy or ignored message numbers | ||
| 2338 |
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110252 | } while (is_busy(*msgno) || ignore_message(*msgno, *site, "proposer_task")); |
| 2339 | 110240 | FINALLY | |
| 2340 |
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113420 | TASK_END; |
| 2341 | } | ||
| 2342 | |||
| 2343 | /* Send messages by fetching from the input queue and trying to get it accepted | ||
| 2344 | by a Paxos instance */ | ||
| 2345 | 341106 | static int proposer_task(task_arg arg) { | |
| 2346 | DECL_ENV | ||
| 2347 | int self; /* ID of this proposer task */ | ||
| 2348 | pax_machine *p; /* Pointer to Paxos instance */ | ||
| 2349 | msg_link *client_msg; /* The client message we are trying to push */ | ||
| 2350 | synode_no msgno; | ||
| 2351 | pax_msg *prepare_msg; | ||
| 2352 | double start_propose; | ||
| 2353 | double start_push; | ||
| 2354 | double delay; | ||
| 2355 | site_def *site; | ||
| 2356 | size_t size; | ||
| 2357 | size_t nr_batched_app_data; | ||
| 2358 | int remote_retry; | ||
| 2359 | synode_allocation_type synode_allocation; | ||
| 2360 | 21970 | ENV_INIT | |
| 2361 | 21970 | END_ENV_INIT | |
| 2362 | END_ENV; | ||
| 2363 | |||
| 2364 | 341106 | synode_reservation_status reservation_status{ | |
| 2365 | synode_reservation_status::number_ok}; | ||
| 2366 | |||
| 2367 |
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|
341106 | TASK_BEGIN |
| 2368 | |||
| 2369 | 21970 | ep->self = get_int_arg(arg); | |
| 2370 | 21970 | ep->p = nullptr; | |
| 2371 | 21970 | ep->client_msg = nullptr; | |
| 2372 | 21970 | ep->prepare_msg = nullptr; | |
| 2373 | 21970 | ep->start_propose = 0.0; | |
| 2374 | 21970 | ep->start_push = 0.0; | |
| 2375 | 21970 | ep->delay = 0.0; | |
| 2376 | 21970 | ep->msgno = current_message; | |
| 2377 | 21970 | ep->site = nullptr; | |
| 2378 | 21970 | ep->size = 0; | |
| 2379 | 21970 | ep->nr_batched_app_data = 0; | |
| 2380 | 21970 | ep->remote_retry = 0; | |
| 2381 | 21970 | ep->synode_allocation = synode_allocation_type::todo; | |
| 2382 | 21970 | add_proposer_synode(ep->self, &ep->msgno); | |
| 2383 | IFDBG(D_NONE, FN; NDBG(ep->self, d); NDBG(task_now(), f)); | ||
| 2384 | |||
| 2385 |
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130694 | while (!xcom_shutdown) { /* Loop until no more work to do */ |
| 2386 | /* Wait for client message */ | ||
| 2387 |
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130694 | assert(!ep->client_msg); |
| 2388 |
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|
260677 | CHANNEL_GET(&prop_input_queue, &ep->client_msg, msg_link); |
| 2389 | 112104 | prop_started++; | |
| 2390 | IFDBG(D_NONE, FN; PTREXP(ep->client_msg->p->a); STRLIT("extracted "); | ||
| 2391 | SYCEXP(ep->client_msg->p->a->app_key)); | ||
| 2392 | |||
| 2393 | /* Grab rest of messages in queue as well, but never batch config messages, | ||
| 2394 | * which need a unique number */ | ||
| 2395 | |||
| 2396 | /* The batch is limited either by size or number of batched app_datas. | ||
| 2397 | * We limit the number of elements because the XDR deserialization | ||
| 2398 | * implementation is recursive, and batching too many app_datas will cause a | ||
| 2399 | * call stack overflow. */ | ||
| 2400 |
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|
219757 | if (!is_config(ep->client_msg->p->a->body.c_t) && |
| 2401 | 107653 | !is_view(ep->client_msg->p->a->body.c_t)) { | |
| 2402 |
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|
101305 | ep->size = app_data_size(ep->client_msg->p->a); |
| 2403 | 101305 | ep->nr_batched_app_data = 1; | |
| 2404 | 101305 | while (AUTOBATCH && ep->size <= MAX_BATCH_SIZE && | |
| 2405 |
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|
204792 | ep->nr_batched_app_data <= MAX_BATCH_APP_DATA && |
| 2406 | 102396 | !link_empty(&prop_input_queue | |
| 2407 | .data)) { /* Batch payloads into single message */ | ||
| 2408 | msg_link *tmp; | ||
| 2409 | app_data_ptr atmp; | ||
| 2410 | |||
| 2411 |
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|
1141 | CHANNEL_GET(&prop_input_queue, &tmp, msg_link); |
| 2412 | 1141 | atmp = tmp->p->a; | |
| 2413 |
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|
1141 | ep->size += app_data_size(atmp); |
| 2414 | 1141 | ep->nr_batched_app_data++; | |
| 2415 | /* Abort batching if config or too big batch */ | ||
| 2416 |
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|
2255 | if (is_config(atmp->body.c_t) || is_view(atmp->body.c_t) || |
| 2417 |
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3346 | ep->nr_batched_app_data > MAX_BATCH_APP_DATA || |
| 2418 |
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1091 | ep->size > MAX_BATCH_SIZE) { |
| 2419 |
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|
50 | channel_put_front(&prop_input_queue, &tmp->l); |
| 2420 | 50 | break; | |
| 2421 | } | ||
| 2422 | ADD_T_EV(seconds(), __FILE__, __LINE__, "batching"); | ||
| 2423 | |||
| 2424 | 1091 | tmp->p->a = nullptr; /* Steal this payload */ | |
| 2425 |
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|
1091 | msg_link_delete(&tmp); /* Get rid of the empty message */ |
| 2426 | 1091 | atmp->next = ep->client_msg->p->a; /* Add to list of app_data */ | |
| 2427 | /* G_TRACE("Batching %s %s", | ||
| 2428 | * cargo_type_to_str(ep->client_msg->p->a->body.c_t), */ | ||
| 2429 | /* cargo_type_to_str(atmp->body.c_t)); */ | ||
| 2430 | 1091 | ep->client_msg->p->a = atmp; | |
| 2431 | IFDBG(D_NONE, FN; PTREXP(ep->client_msg->p->a); STRLIT("extracted "); | ||
| 2432 | SYCEXP(ep->client_msg->p->a->app_key)); | ||
| 2433 | } | ||
| 2434 | } | ||
| 2435 | |||
| 2436 |
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|
112104 | ep->start_propose = task_now(); |
| 2437 | 112104 | ep->delay = 0.0; | |
| 2438 | |||
| 2439 |
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|
112104 | assert(!ep->client_msg->p->a->chosen); |
| 2440 | |||
| 2441 | /* It is a new message */ | ||
| 2442 | |||
| 2443 |
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|
112104 | assert(!synode_eq(current_message, null_synode)); |
| 2444 | |||
| 2445 | /* Assign a log sequence number only on initial propose */ | ||
| 2446 | { | ||
| 2447 |
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112104 | uint64_t prop_lsn = assign_lsn(); |
| 2448 | 112104 | app_data_ptr ap = ep->client_msg->p->a; | |
| 2449 | /* Assign to all app_data structs */ | ||
| 2450 |
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|
225338 | while (ap) { |
| 2451 | 113234 | ap->lsn = prop_lsn; | |
| 2452 | 113234 | ap = ap->next; | |
| 2453 | } | ||
| 2454 | } | ||
| 2455 | DBGOUT_ASSERT(check_lsn(ep->client_msg->p->a), STRLIT("NULL lsn")); | ||
| 2456 | 112104 | retry_new: | |
| 2457 | /* Find a free slot */ | ||
| 2458 |
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|
259536 | TASK_CALL(reserve_synode_number(&ep->synode_allocation, &ep->site, |
| 2459 | &ep->msgno, &ep->remote_retry, | ||
| 2460 | ep->client_msg->p->a, &reservation_status)); | ||
| 2461 | |||
| 2462 | // Check result of reservation | ||
| 2463 |
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|
110240 | if (reservation_status == synode_reservation_status::no_nodes) { |
| 2464 | ✗ | GOTO(retry_new); | |
| 2465 |
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|
110240 | } else if (reservation_status == |
| 2466 | synode_reservation_status::delivery_timeout) { | ||
| 2467 | ✗ | GOTO(next); | |
| 2468 | } | ||
| 2469 | // If we get here, we have a valid synode number | ||
| 2470 |
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|
110240 | assert(!synode_eq(ep->msgno, null_synode)); |
| 2471 | |||
| 2472 | /* See if we can do anything with this message */ | ||
| 2473 |
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|
110240 | if (!ep->site || get_nodeno(ep->site) == VOID_NODE_NO) { |
| 2474 | /* Give up */ | ||
| 2475 | DBGOUT_ASSERT(check_lsn(ep->client_msg->p->a), STRLIT("NULL lsn")); | ||
| 2476 | IFDBG(D_NONE, FN; STRLIT("delivery_failure "); SYCEXP(ep->msgno); | ||
| 2477 | PTREXP(ep->site); NDBG(get_nodeno(ep->site), u)); | ||
| 2478 |
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|
338 | deliver_to_app(nullptr, ep->client_msg->p->a, delivery_failure); |
| 2479 | 338 | GOTO(next); | |
| 2480 | } | ||
| 2481 | |||
| 2482 |
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109902 | brand_client_msg(ep->client_msg->p, ep->msgno); |
| 2483 | |||
| 2484 | for (;;) { /* Loop until the client message has been learned */ | ||
| 2485 | /* Get a Paxos instance to send the client message */ | ||
| 2486 | |||
| 2487 |
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|
109902 | TASK_CALL(wait_for_cache(&ep->p, ep->msgno, 60)); |
| 2488 |
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109902 | if (!ep->p) { |
| 2489 | ✗ | G_MESSAGE("Could not get a pax_machine for msgno %lu. Retrying", | |
| 2490 | (unsigned long)ep->msgno.msgno); | ||
| 2491 | ✗ | goto retry_new; | |
| 2492 | } | ||
| 2493 | |||
| 2494 |
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109902 | assert(ep->p); |
| 2495 |
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109902 | if (ep->client_msg->p->force_delivery) |
| 2496 | 27 | ep->p->force_delivery = ep->client_msg->p->force_delivery; | |
| 2497 | { | ||
| 2498 |
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109902 | [[maybe_unused]] int lock = lock_pax_machine(ep->p); |
| 2499 |
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|
109902 | assert(!lock); |
| 2500 | } | ||
| 2501 | |||
| 2502 | /* Set the client message as current proposal */ | ||
| 2503 |
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109902 | assert(ep->client_msg->p); |
| 2504 |
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109902 | replace_pax_msg(&ep->p->proposer.msg, clone_pax_msg(ep->client_msg->p)); |
| 2505 |
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|
109902 | if (ep->p->proposer.msg == nullptr) { |
| 2506 | ✗ | g_critical( | |
| 2507 | "Node %u has run out of memory while sending a message and " | ||
| 2508 | "will now exit.", | ||
| 2509 | get_nodeno(proposer_site)); | ||
| 2510 | ✗ | terminate_and_exit(); /* Tell xcom to stop */ | |
| 2511 | ✗ | TERMINATE; | |
| 2512 | } | ||
| 2513 |
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109902 | assert(ep->p->proposer.msg); |
| 2514 | PAX_MSG_SANITY_CHECK(ep->p->proposer.msg); | ||
| 2515 | |||
| 2516 | /* Create the prepare message */ | ||
| 2517 |
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109902 | unchecked_replace_pax_msg(&ep->prepare_msg, |
| 2518 |
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|
109902 | pax_msg_new(ep->msgno, ep->site)); |
| 2519 | IFDBG(D_NONE, FN; PTREXP(ep->client_msg->p->a); STRLIT("pushing "); | ||
| 2520 | SYCEXP(ep->msgno)); | ||
| 2521 | IFDBG(D_NONE, FN; COPY_AND_FREE_GOUT(dbg_app_data(ep->prepare_msg->a))); | ||
| 2522 | |||
| 2523 | /* Use 3 phase algorithm if threephase is set or we are forcing or we have | ||
| 2524 | already accepted something, which may happen if another node has timed | ||
| 2525 | out waiting for this node and proposed a no_op, which we have accepted. | ||
| 2526 | |||
| 2527 | We *must* use 3 phase algorithm if the synode was allocated by | ||
| 2528 | ourselves using `global_synode_allocator`. This is last resort synode | ||
| 2529 | allocation that does not guarantee we will be the only Proposer using | ||
| 2530 | it. Therefore, for correctness we must use regular 3 phase Paxos, | ||
| 2531 | because we may have dueling Proposers. | ||
| 2532 | */ | ||
| 2533 |
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109902 | if (threephase || ep->p->force_delivery || ep->p->acceptor.promise.cnt || |
| 2534 |
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|
109825 | ep->synode_allocation == synode_allocation_type::global) { |
| 2535 |
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|
77 | push_msg_3p(ep->site, ep->p, ep->prepare_msg, ep->msgno, normal); |
| 2536 | } else { | ||
| 2537 |
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|
109825 | push_msg_2p(ep->site, ep->p); |
| 2538 | } | ||
| 2539 | |||
| 2540 |
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109902 | ep->start_push = task_now(); |
| 2541 | |||
| 2542 |
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116095 | while (!finished(ep->p)) { /* Try to get a value accepted */ |
| 2543 | /* We will wake up periodically, and whenever a message arrives */ | ||
| 2544 |
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|
232190 | TIMED_TASK_WAIT(&ep->p->rv, ep->delay = wakeup_delay(ep->delay)); |
| 2545 |
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231790 | if (!synode_eq(ep->msgno, ep->p->synode) || |
| 2546 |
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|
115895 | ep->p->proposer.msg == nullptr) { |
| 2547 | IFDBG(D_NONE, FN; STRLIT("detected stolen state machine, retry");); | ||
| 2548 | /* unlock_pax_machine(ep->p); */ | ||
| 2549 | ✗ | GOTO(retry_new); /* Need to break out of both loops, | |
| 2550 | and we have no "exit named | ||
| 2551 | loop" construction */ | ||
| 2552 | } | ||
| 2553 |
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115895 | assert(synode_eq(ep->msgno, ep->p->synode) && ep->p->proposer.msg); |
| 2554 |
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|
115895 | if (finished(ep->p)) break; |
| 2555 | { | ||
| 2556 |
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|
6193 | double now = task_now(); |
| 2557 | #ifdef DELIVERY_TIMEOUT | ||
| 2558 | if ((ep->start_propose + ep->client_msg->p->a->expiry_time) < now) { | ||
| 2559 | IFDBG(D_NONE, FN; STRLIT("timeout when pushing "); | ||
| 2560 | SYCEXP(ep->msgno); SYCEXP(executed_msg)); | ||
| 2561 | /* Proposing a no-op here is a last ditch effort to cancel the | ||
| 2562 | failed message. If any of the currently reachable nodes have | ||
| 2563 | participated in the failed consensus round, it is equivalent to | ||
| 2564 | retrying a final time, otherwise we could get a no-op | ||
| 2565 | accepted. Proposing a no-op is always harmless. | ||
| 2566 | Having a timeout on delivery and telling the client is really | ||
| 2567 | contrary to the spirit of | ||
| 2568 | Paxos, since we cannot guarantee that the message has not been | ||
| 2569 | delivered, but at the moment, MCM depends on it. | ||
| 2570 | Proposing a no-op here increases the probability that the outcome | ||
| 2571 | matches what we tell MCM about the outcome. */ | ||
| 2572 | propose_noop(ep->msgno, ep->p); | ||
| 2573 | DBGOUT_ASSERT(check_lsn(ep->client_msg->p->a), STRLIT("NULL lsn")); | ||
| 2574 | IFDBG(D_NONE, FN; STRLIT("timeout -> delivery_failure")); | ||
| 2575 | deliver_to_app(ep->p, ep->client_msg->p->a, delivery_failure); | ||
| 2576 | unlock_pax_machine(ep->p); | ||
| 2577 | GOTO(next); | ||
| 2578 | } | ||
| 2579 | #endif | ||
| 2580 |
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|
6193 | if ((ep->start_push + ep->delay) <= now) { |
| 2581 | PAX_MSG_SANITY_CHECK(ep->p->proposer.msg); | ||
| 2582 | IFDBG(D_NONE, FN; STRLIT("retry pushing "); SYCEXP(ep->msgno)); | ||
| 2583 | IFDBG(D_NONE, FN; | ||
| 2584 | COPY_AND_FREE_GOUT(dbg_app_data(ep->prepare_msg->a));); | ||
| 2585 | IFDBG(D_NONE, BALCEXP(ep->p->proposer.bal); | ||
| 2586 | BALCEXP(ep->p->acceptor.promise)); | ||
| 2587 |
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|
3521 | push_msg_3p(ep->site, ep->p, ep->prepare_msg, ep->msgno, normal); |
| 2588 | 3521 | ep->start_push = now; | |
| 2589 | } | ||
| 2590 | } | ||
| 2591 | } | ||
| 2592 | /* When we get here, we know the value for this message number, | ||
| 2593 | but it may not be the value we tried to push, | ||
| 2594 | so loop until we have a successful push. */ | ||
| 2595 |
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|
109702 | unlock_pax_machine(ep->p); |
| 2596 | IFDBG(D_NONE, FN; STRLIT(" found finished message "); SYCEXP(ep->msgno); | ||
| 2597 | STRLIT("seconds since last push "); | ||
| 2598 | NPUT(task_now() - ep->start_push, f); STRLIT("ep->client_msg "); | ||
| 2599 | COPY_AND_FREE_GOUT(dbg_pax_msg(ep->client_msg->p));); | ||
| 2600 | IFDBG(D_NONE, FN; STRLIT("ep->p->learner.msg "); | ||
| 2601 | COPY_AND_FREE_GOUT(dbg_pax_msg(ep->p->learner.msg));); | ||
| 2602 |
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|
109702 | if (match_my_msg(ep->p->learner.msg, ep->client_msg->p)) { |
| 2603 | 108386 | break; | |
| 2604 | } else | ||
| 2605 | 1316 | GOTO(retry_new); | |
| 2606 | } | ||
| 2607 | 108724 | next : { | |
| 2608 |
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108724 | double now = task_now(); |
| 2609 | 108724 | double used = now - ep->start_propose; | |
| 2610 |
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|
108724 | add_to_filter(used); |
| 2611 | 108724 | prop_finished++; | |
| 2612 | IFDBG(D_NONE, FN; STRLIT("completed ep->msgno "); SYCEXP(ep->msgno); | ||
| 2613 | NDBG(used, f); NDBG(median_time(), f); | ||
| 2614 | STRLIT("seconds since last push "); NDBG(now - ep->start_push, f);); | ||
| 2615 | IFDBG(D_NONE, FN; STRLIT("ep->client_msg "); | ||
| 2616 | COPY_AND_FREE_GOUT(dbg_pax_msg(ep->client_msg->p));); | ||
| 2617 | 108724 | if (ep->p) { | |
| 2618 | IFDBG(D_NONE, FN; STRLIT("ep->p->learner.msg "); | ||
| 2619 | COPY_AND_FREE_GOUT(dbg_pax_msg(ep->p->learner.msg));); | ||
| 2620 | } | ||
| 2621 |
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108724 | msg_link_delete(&ep->client_msg); |
| 2622 | } | ||
| 2623 | } | ||
| 2624 | ✗ | FINALLY | |
| 2625 | IFDBG(D_BUG, FN; STRLIT("exit "); NDBG(ep->self, d); NDBG(task_now(), f)); | ||
| 2626 |
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21900 | if (ep->p) { |
| 2627 |
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|
20558 | unlock_pax_machine(ep->p); |
| 2628 | } | ||
| 2629 |
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21900 | replace_pax_msg(&ep->prepare_msg, nullptr); |
| 2630 |
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|
21900 | if (ep->client_msg) { /* If we get here with a client message, we have |
| 2631 | failed to deliver */ | ||
| 2632 | DBGOUT_ASSERT(check_lsn(ep->client_msg->p->a), STRLIT("NULL lsn")); | ||
| 2633 | IFDBG(D_NONE, FN; | ||
| 2634 | STRLIT("undelivered message at task end -> delivery_failure")); | ||
| 2635 |
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|
3380 | deliver_to_app(ep->p, ep->client_msg->p->a, delivery_failure); |
| 2636 |
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|
3380 | msg_link_delete(&ep->client_msg); |
| 2637 | } | ||
| 2638 | 21900 | remove_proposer_synode(ep->self); | |
| 2639 |
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|
21900 | TASK_END; |
| 2640 | } | ||
| 2641 | |||
| 2642 | static xcom_proto constexpr first_protocol_that_ignores_intermediate_forced_configs_or_views = | ||
| 2643 | x_1_8; | ||
| 2644 | |||
| 2645 | 2 | static bool constexpr should_ignore_forced_config_or_view( | |
| 2646 | xcom_proto protocol_version) { | ||
| 2647 | 2 | return protocol_version >= | |
| 2648 | 2 | first_protocol_that_ignores_intermediate_forced_configs_or_views; | |
| 2649 | } | ||
| 2650 | |||
| 2651 | 79660 | static node_no get_leader(site_def const *s) { | |
| 2652 |
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79660 | if (s) { |
| 2653 | 79660 | node_no leader = 0; | |
| 2654 |
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|
82558 | for (leader = 0; leader < get_maxnodes(s); leader++) { |
| 2655 |
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|
81955 | if (!may_be_dead(s->detected, leader, task_now())) return leader; |
| 2656 | } | ||
| 2657 | } | ||
| 2658 | 603 | return 0; | |
| 2659 | } | ||
| 2660 | |||
| 2661 | 79660 | int iamthegreatest(site_def const *s) { | |
| 2662 |
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|
79660 | if (!s) |
| 2663 | ✗ | return 0; | |
| 2664 | else | ||
| 2665 | 79660 | return get_leader(s) == s->nodeno; | |
| 2666 | } | ||
| 2667 | |||
| 2668 | // Update site based on incoming global node set | ||
| 2669 | 54 | static site_def *update_site(site_def *site, node_set const *ns, | |
| 2670 | synode_no boot_key, synode_no start) { | ||
| 2671 | // If it has not changed, no action is necessary. | ||
| 2672 | // If it has changed, we need to create and install | ||
| 2673 | // a new site def, since the changed node set will influence which | ||
| 2674 | // messages will be ignored. | ||
| 2675 | // This change needs to be effective after the current pipeline | ||
| 2676 | // of messages has been emptied, just as if we had | ||
| 2677 | // changed the config (site_def) itself. | ||
| 2678 | |||
| 2679 |
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|
54 | if (!equal_node_set(ns, &site->global_node_set)) { |
| 2680 | 12 | site_def *new_config = clone_site_def(get_site_def()); | |
| 2681 |
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|
12 | assert(new_config); |
| 2682 | 12 | new_config->start = start; | |
| 2683 | 12 | new_config->boot_key = boot_key; | |
| 2684 | // Update node set of site | ||
| 2685 | 12 | copy_node_set(ns, &new_config->global_node_set); | |
| 2686 | 12 | return new_config; | |
| 2687 | } | ||
| 2688 | 42 | return nullptr; | |
| 2689 | } | ||
| 2690 | |||
| 2691 | 213388 | void execute_msg(site_def *site, pax_machine *pma, pax_msg *p) { | |
| 2692 | 213388 | app_data_ptr a = p->a; | |
| 2693 | IFDBG(D_EXEC, FN; COPY_AND_FREE_GOUT(dbg_pax_msg(p));); | ||
| 2694 |
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213388 | if (a) { |
| 2695 |
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|
213388 | switch (a->body.c_t) { |
| 2696 | 867 | case unified_boot_type: | |
| 2697 | case force_config_type: | ||
| 2698 | 867 | deliver_config(a); | |
| 2699 | 6568 | case add_node_type: | |
| 2700 | case remove_node_type: | ||
| 2701 | 6568 | break; | |
| 2702 | 195452 | case app_type: | |
| 2703 | IFDBG(D_NONE, FN; STRLIT(" learner.msg "); | ||
| 2704 | COPY_AND_FREE_GOUT(dbg_pax_msg(pma->learner.msg));); | ||
| 2705 | /* DBGOUT_ASSERT(check_lsn(a), STRLIT("NULL lsn")); */ | ||
| 2706 | 195452 | deliver_to_app(pma, a, delivery_ok); | |
| 2707 | 195452 | break; | |
| 2708 | 11245 | case view_msg: { | |
| 2709 | /* Deliver view like we used to when every member was always a leader. | ||
| 2710 | * This ensures deterministic behaviour in groups with some members | ||
| 2711 | * running previous XCom instances. | ||
| 2712 | */ | ||
| 2713 | IFDBG(D_EXEC, FN; STRLIT(" global view "); | ||
| 2714 | COPY_AND_FREE_GOUT(dbg_pax_msg(pma->learner.msg));); | ||
| 2715 |
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|
11245 | if (site && site->global_node_set.node_set_len == |
| 2716 |
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|
11245 | a->body.app_u_u.present.node_set_len) { |
| 2717 |
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|
11247 | if ((p->force_delivery != 0) && |
| 2718 | 2 | should_ignore_forced_config_or_view(site->x_proto)) { | |
| 2719 |
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|
2 | G_DEBUG( |
| 2720 | "execute_msg: Ignoring a forced intermediate, pending " | ||
| 2721 | "view_msg"); | ||
| 2722 | } else { | ||
| 2723 |
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|
11243 | assert(site->global_node_set.node_set_len == |
| 2724 | a->body.app_u_u.present.node_set_len); | ||
| 2725 | // Can only mutate site->global_node_set if everyone is a leader and | ||
| 2726 | // has its own channel. | ||
| 2727 |
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|
11243 | if (site->max_active_leaders == active_leaders_all) { |
| 2728 | 11185 | copy_node_set(&a->body.app_u_u.present, &site->global_node_set); | |
| 2729 | } | ||
| 2730 | 11243 | deliver_global_view_msg(site, a->body.app_u_u.present, p->synode); | |
| 2731 | ADD_DBG(D_BASE, | ||
| 2732 | add_event(EVENT_DUMP_PAD, | ||
| 2733 | string_arg("deliver_global_view_msg p->synode")); | ||
| 2734 | add_synode_event(p->synode);); | ||
| 2735 | } | ||
| 2736 | } | ||
| 2737 | |||
| 2738 | /* If this view_msg is: | ||
| 2739 | * | ||
| 2740 | * (1) about the latest site, and | ||
| 2741 | * (2) only some member(s) is (are) leader(s) in the latest site, | ||
| 2742 | * | ||
| 2743 | * create a new site to deterministically ignore the channel of leaders | ||
| 2744 | * that may be dead. */ | ||
| 2745 | 11245 | site_def *latest_site = get_site_def_rw(); | |
| 2746 | IFDBG( | ||
| 2747 | D_EXEC, FN; PTREXP(latest_site); if (latest_site) { | ||
| 2748 | NUMEXP(latest_site->nodes.node_list_len); | ||
| 2749 | NUMEXP(latest_site->global_node_set.node_set_len); | ||
| 2750 | NUMEXP(a->body.app_u_u.present.node_set_len); | ||
| 2751 | SYCEXP(a->app_key); | ||
| 2752 | SYCEXP(latest_site->start); | ||
| 2753 | }); | ||
| 2754 | /* | ||
| 2755 | * You'll want to install the new site if xcom is operating as | ||
| 2756 | * single-leader and there were no changes in the configuration. The | ||
| 2757 | * reason for this is so that you have the latest information about | ||
| 2758 | * who is the preferred and actual leader. | ||
| 2759 | */ | ||
| 2760 | 11245 | bool const is_latest_view = synode_gt(a->app_key, latest_site->start); | |
| 2761 | 11245 | bool const everyone_leader_in_latest_site = | |
| 2762 | 11245 | (latest_site->max_active_leaders == active_leaders_all); | |
| 2763 | 11245 | bool const view_node_set_matches_latest_site = | |
| 2764 | 11245 | (latest_site->global_node_set.node_set_len == | |
| 2765 | 11245 | a->body.app_u_u.present.node_set_len); | |
| 2766 | 22466 | const bool can_install_site = is_latest_view && | |
| 2767 |
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|
11245 | !everyone_leader_in_latest_site && |
| 2768 | view_node_set_matches_latest_site; | ||
| 2769 | |||
| 2770 |
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|
11245 | if (can_install_site) { |
| 2771 | 54 | a->app_key = p->synode; // Patch app_key to avoid fixing getstart() | |
| 2772 | 54 | site_def *new_config = update_site( | |
| 2773 | 54 | latest_site, &a->body.app_u_u.present, a->app_key, getstart(a)); | |
| 2774 |
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|
54 | if (new_config) { |
| 2775 | IFDBG(D_EXEC, FN; PTREXP(new_config); | ||
| 2776 | NUMEXP(new_config->nodes.node_list_len); | ||
| 2777 | NUMEXP(new_config->global_node_set.node_set_len); | ||
| 2778 | SYCEXP(a->app_key); SYCEXP(new_config->start);); | ||
| 2779 | 12 | site_install_action(new_config, a->body.c_t); | |
| 2780 | 12 | analyze_leaders(new_config); | |
| 2781 | } | ||
| 2782 | } | ||
| 2783 | 11245 | } break; | |
| 2784 | 123 | default: | |
| 2785 | 123 | break; | |
| 2786 | } | ||
| 2787 | } | ||
| 2788 | IFDBG(D_NONE, FN; SYCEXP(p->synode)); | ||
| 2789 | 213388 | } | |
| 2790 | |||
| 2791 | static void read_missing_values(int n); | ||
| 2792 | static void propose_missing_values(int n); | ||
| 2793 | |||
| 2794 | #ifdef EXECUTOR_TASK_AGGRESSIVE_NO_OP | ||
| 2795 | /* With many nodes sending read_ops on instances that are not decided yet, it | ||
| 2796 | * may take a very long time until someone finally decides to start a new | ||
| 2797 | * consensus round. As the cost of a new proposal is not that great, it's | ||
| 2798 | * acceptable to go directly to proposing a no-op instead of first trying to | ||
| 2799 | * get the value with a read_op. An added benefit of this is that if more than | ||
| 2800 | * one node needs the result, they will get it all when the consensus round | ||
| 2801 | * finishes. */ | ||
| 2802 | static void find_value(site_def const *site, unsigned int *wait, int n) { | ||
| 2803 | IFDBG(D_NONE, FN; NDBG(*wait, d)); | ||
| 2804 | |||
| 2805 | if (get_nodeno(site) == VOID_NODE_NO) { | ||
| 2806 | read_missing_values(n); | ||
| 2807 | return; | ||
| 2808 | } | ||
| 2809 | |||
| 2810 | if ((*wait) > 1 || /* Only leader will propose initially */ | ||
| 2811 | ((*wait) > 0 && iamthegreatest(site))) | ||
| 2812 | propose_missing_values(n); | ||
| 2813 | |||
| 2814 | #ifdef TASK_EVENT_TRACE | ||
| 2815 | if ((*wait) > 1) dump_task_events(); | ||
| 2816 | #endif | ||
| 2817 | (*wait)++; | ||
| 2818 | } | ||
| 2819 | #else | ||
| 2820 | 516612 | static void find_value(site_def const *site, unsigned int *wait, int n) { | |
| 2821 | IFDBG(D_NONE, FN; NDBG(*wait, d)); | ||
| 2822 | |||
| 2823 |
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|
516612 | if (get_nodeno(site) == VOID_NODE_NO) { |
| 2824 | 6993 | read_missing_values(n); | |
| 2825 | 6993 | return; | |
| 2826 | } | ||
| 2827 | |||
| 2828 |
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|
509619 | switch (*wait) { |
| 2829 | 350061 | case 0: | |
| 2830 | case 1: | ||
| 2831 | 350061 | read_missing_values(n); | |
| 2832 | 350061 | (*wait)++; | |
| 2833 | 350061 | break; | |
| 2834 | 79058 | case 2: | |
| 2835 |
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|
79058 | if (iamthegreatest(site)) |
| 2836 | 48555 | propose_missing_values(n); | |
| 2837 | else | ||
| 2838 | 30503 | read_missing_values(n); | |
| 2839 | 79058 | (*wait)++; | |
| 2840 | 79058 | break; | |
| 2841 | 80500 | case 3: | |
| 2842 | 80500 | propose_missing_values(n); | |
| 2843 | 80500 | break; | |
| 2844 | ✗ | default: | |
| 2845 | ✗ | break; | |
| 2846 | } | ||
| 2847 | } | ||
| 2848 | #endif /* EXECUTOR_TASK_AGGRESSIVE_NO_OP */ | ||
| 2849 | |||
| 2850 | static void dump_debug_exec_state(); | ||
| 2851 | |||
| 2852 | #ifdef PROPOSE_IF_LEADER | ||
| 2853 | int get_xcom_message(pax_machine **p, synode_no msgno, int n) { | ||
| 2854 | DECL_ENV | ||
| 2855 | unsigned int wait; | ||
| 2856 | double delay; | ||
| 2857 | site_def const *site; | ||
| 2858 | ENV_INIT | ||
| 2859 | END_ENV_INIT | ||
| 2860 | END_ENV; | ||
| 2861 | |||
| 2862 | TASK_BEGIN | ||
| 2863 | |||
| 2864 | ep->wait = 0; | ||
| 2865 | ep->delay = 0.0; | ||
| 2866 | *p = force_get_cache(msgno); | ||
| 2867 | ep->site = NULL; | ||
| 2868 | |||
| 2869 | dump_debug_exec_state(); | ||
| 2870 | while (!finished(*p)) { | ||
| 2871 | ep->site = find_site_def(msgno); | ||
| 2872 | /* The end of the world ?, fake message by skipping */ | ||
| 2873 | if (get_maxnodes(ep->site) == 0) { | ||
| 2874 | pax_msg *msg = pax_msg_new(msgno, ep->site); | ||
| 2875 | handle_skip(ep->site, *p, msg); | ||
| 2876 | break; | ||
| 2877 | } | ||
| 2878 | IFDBG(D_NONE, FN; STRLIT(" not finished "); SYCEXP(msgno); PTREXP(*p); | ||
| 2879 | NDBG(ep->wait, u); SYCEXP(msgno)); | ||
| 2880 | if (get_maxnodes(ep->site) > 1 && iamthegreatest(ep->site) && | ||
| 2881 | ep->site->global_node_set.node_set_val && | ||
| 2882 | !ep->site->global_node_set.node_set_val[msgno.node] && | ||
| 2883 | may_be_dead(ep->site->detected, msgno.node, task_now())) { | ||
| 2884 | propose_missing_values(n); | ||
| 2885 | } else { | ||
| 2886 | find_value(ep->site, &ep->wait, n); | ||
| 2887 | } | ||
| 2888 | TIMED_TASK_WAIT(&(*p)->rv, ep->delay = wakeup_delay(ep->delay)); | ||
| 2889 | *p = get_cache(msgno); | ||
| 2890 | dump_debug_exec_state(); | ||
| 2891 | } | ||
| 2892 | |||
| 2893 | FINALLY | ||
| 2894 | IFDBG(D_NONE, FN; SYCEXP(msgno); PTREXP(*p); NDBG(ep->wait, u); | ||
| 2895 | SYCEXP(msgno)); | ||
| 2896 | TASK_END; | ||
| 2897 | } | ||
| 2898 | #else | ||
| 2899 | 1109334 | int get_xcom_message(pax_machine **p, synode_no msgno, int n) { | |
| 2900 | DECL_ENV | ||
| 2901 | unsigned int wait; | ||
| 2902 | double delay; | ||
| 2903 | site_def const *site; | ||
| 2904 | 592729 | ENV_INIT | |
| 2905 | 592729 | END_ENV_INIT | |
| 2906 | END_ENV; | ||
| 2907 | |||
| 2908 |
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1109334 | TASK_BEGIN |
| 2909 | |||
| 2910 | 592729 | ep->wait = 0; | |
| 2911 | 592729 | ep->delay = 0.0; | |
| 2912 | 592729 | *p = force_get_cache(msgno); | |
| 2913 | 592729 | ep->site = nullptr; | |
| 2914 | |||
| 2915 | 592729 | dump_debug_exec_state(); | |
| 2916 |
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1109313 | while (!finished(*p)) { |
| 2917 | 516612 | ep->site = find_site_def(msgno); | |
| 2918 | /* The end of the world ?, fake message by skipping */ | ||
| 2919 |
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516612 | if (get_maxnodes(ep->site) == 0) { |
| 2920 | ✗ | pax_msg *msg = pax_msg_new(msgno, ep->site); | |
| 2921 | ✗ | handle_skip(ep->site, *p, msg); | |
| 2922 | ✗ | break; | |
| 2923 | } | ||
| 2924 | IFDBG(D_NONE, FN; STRLIT("before find_value"); SYCEXP(msgno); PTREXP(*p); | ||
| 2925 | NDBG(ep->wait, u); SYCEXP(msgno)); | ||
| 2926 | 516612 | find_value(ep->site, &ep->wait, n); | |
| 2927 | IFDBG(D_NONE, FN; STRLIT("after find_value"); SYCEXP(msgno); PTREXP(*p); | ||
| 2928 | NDBG(ep->wait, u); SYCEXP(msgno)); | ||
| 2929 | 516612 | ep->delay = wakeup_delay(ep->delay); | |
| 2930 | IFDBG(D_NONE, FN; NDBG(ep->delay, f)); | ||
| 2931 |
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|
1033217 | TIMED_TASK_WAIT(&(*p)->rv, ep->delay); |
| 2932 | 516584 | *p = get_cache(msgno); | |
| 2933 | 516584 | dump_debug_exec_state(); | |
| 2934 | } | ||
| 2935 | |||
| 2936 | 592701 | FINALLY | |
| 2937 |
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|
592722 | TASK_END; |
| 2938 | } | ||
| 2939 | #endif | ||
| 2940 | |||
| 2941 | 598149 | synode_no set_executed_msg(synode_no msgno) { | |
| 2942 | IFDBG(D_EXEC, FN; STRLIT("changing executed_msg from "); SYCEXP(executed_msg); | ||
| 2943 | STRLIT(" to "); SYCEXP(msgno)); | ||
| 2944 |
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1196298 | if (group_mismatch(msgno, current_message) || |
| 2945 |
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|
598149 | synode_gt(msgno, current_message)) { |
| 2946 | IFDBG(D_EXEC, FN; STRLIT("changing current message")); | ||
| 2947 | 211591 | set_current_message(first_free_synode_local(msgno)); | |
| 2948 | } | ||
| 2949 | |||
| 2950 |
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598149 | if (msgno.msgno > executed_msg.msgno) task_wakeup(&exec_wait); |
| 2951 | |||
| 2952 | 598149 | executed_msg = msgno; | |
| 2953 | 598149 | executor_site = find_site_def_rw(executed_msg); | |
| 2954 | 598149 | return executed_msg; | |
| 2955 | } | ||
| 2956 | |||
| 2957 | 212951 | static synode_no first_free_synode_local(synode_no msgno) { | |
| 2958 |
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|
212951 | site_def const *site = find_site_def(msgno); |
| 2959 | 212951 | synode_no retval = msgno; | |
| 2960 |
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|
212951 | if (!site) { |
| 2961 | /* purecov: begin deadcode */ | ||
| 2962 | ✗ | site = get_site_def(); | |
| 2963 | IFDBG(D_NONE, FN; PTREXP(site); SYCEXP(msgno)); | ||
| 2964 | ✗ | assert(get_group_id(site) != 0); | |
| 2965 | /* purecov: end */ | ||
| 2966 | } | ||
| 2967 |
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|
212951 | if (get_group_id(site) == 0) { |
| 2968 | IFDBG(D_NONE, FN; PTREXP(site); SYCEXP(msgno)); | ||
| 2969 | if (site) { | ||
| 2970 | IFDBG(D_NONE, FN; SYCEXP(site->boot_key); SYCEXP(site->start); | ||
| 2971 | COPY_AND_FREE_GOUT(dbg_site_def(site))); | ||
| 2972 | } | ||
| 2973 | } | ||
| 2974 |
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|
212951 | assert(get_group_id(site) != 0); |
| 2975 |
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|
212951 | assert(!synode_eq(msgno, null_synode)); |
| 2976 |
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|
212951 | if (retval.msgno == 0) retval.msgno = 1; |
| 2977 |
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|
212951 | retval.node = get_nodeno(site); |
| 2978 |
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|
212951 | if (synode_lt(retval, msgno)) |
| 2979 |
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|
60051 | return incr_msgno(retval); |
| 2980 | else | ||
| 2981 | 152900 | return retval; | |
| 2982 | } | ||
| 2983 | |||
| 2984 | 323655 | synode_no set_current_message(synode_no msgno) { | |
| 2985 | IFDBG(D_PROPOSE, FN; STRLIT("changing current_message from "); | ||
| 2986 | SYCEXP(current_message); STRLIT(" to "); SYCEXP(msgno)); | ||
| 2987 | 323655 | return current_message = msgno; | |
| 2988 | } | ||
| 2989 | |||
| 2990 | static void update_max_synode(pax_msg *p); | ||
| 2991 | |||
| 2992 | #if TASK_DBUG_ON | ||
| 2993 | static void perf_dbg(int *_n, int *_old_n, double *_old_t) [[maybe_unused]]; | ||
| 2994 | static void perf_dbg(int *_n, int *_old_n, double *_old_t) { | ||
| 2995 | int n = *_n; | ||
| 2996 | int old_n = *_old_n; | ||
| 2997 | double old_t = *_old_t; | ||
| 2998 | |||
| 2999 | if (!IS_XCOM_DEBUG_WITH(XCOM_DEBUG_TRACE)) return; | ||
| 3000 | |||
| 3001 | IFDBG(D_NONE, FN; SYCEXP(executed_msg)); | ||
| 3002 | if (!(n % 5000)) { | ||
| 3003 | GET_GOUT; | ||
| 3004 | NDBG(get_nodeno(get_site_def()), u); | ||
| 3005 | NDBG(task_now(), f); | ||
| 3006 | NDBG(n, d); | ||
| 3007 | NDBG(median_time(), f); | ||
| 3008 | SYCEXP(executed_msg); | ||
| 3009 | PRINT_GOUT; | ||
| 3010 | FREE_GOUT; | ||
| 3011 | } | ||
| 3012 | (*_n)++; | ||
| 3013 | if (task_now() - old_t > 1.0) { | ||
| 3014 | GET_GOUT; | ||
| 3015 | NDBG(get_nodeno(get_site_def()), u); | ||
| 3016 | NDBG(task_now(), f); | ||
| 3017 | NDBG(n, d); | ||
| 3018 | NDBG((n - old_n) / (task_now() - old_t), f); | ||
| 3019 | PRINT_GOUT; | ||
| 3020 | FREE_GOUT; | ||
| 3021 | *_old_t = task_now(); | ||
| 3022 | *_old_n = n; | ||
| 3023 | } | ||
| 3024 | } | ||
| 3025 | #endif | ||
| 3026 | |||
| 3027 | /* Does address match any current leader? */ | ||
| 3028 | 80 | static inline int match_leader(char const *addr, leader_array const leaders) { | |
| 3029 | u_int i; | ||
| 3030 |
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|
104 | for (i = 0; i < leaders.leader_array_len; i++) { |
| 3031 | IFDBG(D_BASE, FN; NUMEXP(i); NUMEXP(leaders.leader_array_len); STREXP(addr); | ||
| 3032 | STREXP(leaders.leader_array_val[i].address)); | ||
| 3033 |
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|
80 | if (strcmp(addr, leaders.leader_array_val[i].address) == 0) return 1; |
| 3034 | } | ||
| 3035 | 24 | return 0; | |
| 3036 | } | ||
| 3037 | |||
| 3038 | 104 | static inline bool alive_node(site_def const *site, u_int i) { | |
| 3039 | 104 | return is_set(site->global_node_set, i); | |
| 3040 | } | ||
| 3041 | |||
| 3042 | // Find up to site->max_active_leaders leaders. | ||
| 3043 | // If leaders are set by the client, and none of those are alive, revert | ||
| 3044 | // to using the set of addresses in the config. | ||
| 3045 | |||
| 3046 | 71 | void analyze_leaders(site_def *site) { | |
| 3047 |
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|
71 | assert(site); |
| 3048 | // No analysis if all nodes are leaders | ||
| 3049 |
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|
71 | if (active_leaders_all == site->max_active_leaders) return; |
| 3050 | |||
| 3051 | // Use leaders from config if forced or not set by client | ||
| 3052 | 68 | bool use_client_leaders = leaders_set_by_client(site); | |
| 3053 | 68 | site->cached_leaders = true; | |
| 3054 | 68 | site->found_leaders = 0; // Number of active leaders found | |
| 3055 | // Reset everything | ||
| 3056 |
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|
209 | for (u_int i = 0; i < get_maxnodes(site); i++) { |
| 3057 | 141 | site->active_leader[i] = 0; | |
| 3058 | } | ||
| 3059 | // If candidate leaders set by client, check those first | ||
| 3060 |
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|
203 | for (u_int i = 0; use_client_leaders && i < get_maxnodes(site); i++) { |
| 3061 | 270 | if (site->found_leaders < | |
| 3062 | 224 | site->max_active_leaders && // Found enough? | |
| 3063 | // Must be alive according to global | ||
| 3064 | // node set of site | ||
| 3065 |
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|
215 | alive_node(site, i) && |
| 3066 | // Must match a node in the list of leaders | ||
| 3067 | 80 | match_leader(site->nodes.node_list_val[i].address, site->leaders)) { | |
| 3068 | 56 | site->active_leader[i] = 1; | |
| 3069 | 56 | site->found_leaders++; | |
| 3070 | } | ||
| 3071 | } | ||
| 3072 | // Check rest of nodes | ||
| 3073 |
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|
209 | for (u_int i = 0; i < get_maxnodes(site); i++) { |
| 3074 | 367 | if (!site->active_leader[i] && // Avoid duplicates | |
| 3075 |
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|
156 | site->found_leaders < site->max_active_leaders && // Found enough? |
| 3076 | // Must be alive according to global | ||
| 3077 | // node set of site | ||
| 3078 |
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|
15 | alive_node(site, i)) { |
| 3079 | 6 | site->active_leader[i] = 1; | |
| 3080 | 6 | site->found_leaders++; | |
| 3081 | } | ||
| 3082 | } | ||
| 3083 | // We need at least one channel otherwise the group grinds to a halt. | ||
| 3084 |
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|
68 | if (site->found_leaders == 0) { |
| 3085 | 6 | site->active_leader[0] = 1; | |
| 3086 | 6 | site->found_leaders = 1; | |
| 3087 | } | ||
| 3088 | 68 | free(site->dispatch_table); | |
| 3089 | |||
| 3090 | IFDBG(D_BUG, FN; STRLIT("free "); PTREXP(site); PTREXP(site->dispatch_table)); | ||
| 3091 | // Do not work as synode allocator if not active leader. ??? | ||
| 3092 |
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|
127 | if (get_nodeno(site) != VOID_NODE_NO && |
| 3093 |
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|
59 | site->active_leader[get_nodeno(site)]) { |
| 3094 | 33 | site->dispatch_table = primary_dispatch_table(); | |
| 3095 | } else { | ||
| 3096 | 35 | site->dispatch_table = secondary_dispatch_table(); | |
| 3097 | } | ||
| 3098 | IFDBG(D_BUG, FN; STRLIT("allocate "); PTREXP(site); | ||
| 3099 | PTREXP(site->dispatch_table)); | ||
| 3100 | |||
| 3101 |
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|
209 | for (u_int i = 0; i < get_maxnodes(site); i++) { |
| 3102 | IFDBG(D_BUG, FN; NUMEXP(i); PTREXP(site); NUMEXP(site->found_leaders); | ||
| 3103 | NUMEXP(site->max_active_leaders); NUMEXP(alive_node(site, i)); | ||
| 3104 | SYCEXP(site->start); STREXP(site->nodes.node_list_val[i].address); | ||
| 3105 | if (site->active_leader[i]) STRLIT(" says YES"); | ||
| 3106 | else STRLIT(" says NO")); | ||
| 3107 | } | ||
| 3108 | } | ||
| 3109 | |||
| 3110 | /* Is node number an active leader? */ | ||
| 3111 | 1669005 | int is_active_leader(node_no x, site_def *site) { | |
| 3112 | /* No site, no active leaders */ | ||
| 3113 |
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|
1669005 | if (!site) return 0; |
| 3114 | |||
| 3115 | /* Node number out of bound, not an active leader */ | ||
| 3116 |
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|
1669005 | if (x >= get_maxnodes(site)) return 0; |
| 3117 | |||
| 3118 | /* All are leaders, no need for further tests */ | ||
| 3119 |
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|
1662251 | if (active_leaders_all == site->max_active_leaders) return 1; |
| 3120 | /* See if cached values are valid */ | ||
| 3121 |
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|
7904 | if (!site->cached_leaders) { |
| 3122 | 41 | analyze_leaders(site); | |
| 3123 | } | ||
| 3124 | #if 0 | ||
| 3125 | if (site->active_leader == NULL || x > site->nodes.node_list_len - 1) | ||
| 3126 | IFDBG(D_BUG, FN; PTREXP(site->active_leader); NUMEXP(x); | ||
| 3127 | NUMEXP(site->nodeno); NUMEXP(site->nodes.node_list_len);); | ||
| 3128 | #endif | ||
| 3129 | 7904 | return site->active_leader[x]; | |
| 3130 | } | ||
| 3131 | |||
| 3132 | 18 | node_no found_active_leaders(site_def *site) { | |
| 3133 | /* No site, no active leaders */ | ||
| 3134 |
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|
18 | if (!site) return 0; |
| 3135 | |||
| 3136 | /* All are leaders, no need for further tests */ | ||
| 3137 |
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|
18 | if (active_leaders_all == site->max_active_leaders) |
| 3138 | 3 | return site->nodes.node_list_len; | |
| 3139 | |||
| 3140 | /* See if cached values are valid */ | ||
| 3141 |
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|
15 | if (!site->cached_leaders) { |
| 3142 | ✗ | analyze_leaders(site); | |
| 3143 | } | ||
| 3144 | 15 | return site->found_leaders; | |
| 3145 | } | ||
| 3146 | |||
| 3147 | /* Check if this message belongs to a channel that should be ignored */ | ||
| 3148 | 1505672 | static inline int ignore_message(synode_no x, site_def *site, | |
| 3149 | char const *dbg [[maybe_unused]]) { | ||
| 3150 | 1505672 | int retval = !is_active_leader(x.node, site); | |
| 3151 | IFDBG(D_BASE, STRLIT(dbg); STRLIT(" "); FN; SYCEXP(x); NUMEXP(retval)); | ||
| 3152 | 1505672 | return retval; | |
| 3153 | } | ||
| 3154 | |||
| 3155 | /* Check if this node is a leader */ | ||
| 3156 | 113893 | static inline bool is_leader(site_def *site) { | |
| 3157 |
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|
113893 | bool retval = site && is_active_leader(site->nodeno, site); |
| 3158 | IFDBG(D_BASE, FN; PTREXP(site); if (site) NUMEXP(site->nodeno); | ||
| 3159 | NUMEXP(retval)); | ||
| 3160 | 113893 | return retval; | |
| 3161 | } | ||
| 3162 | |||
| 3163 | [[maybe_unused]] static void debug_loser(synode_no x); | ||
| 3164 | #if defined(TASK_DBUG_ON) && TASK_DBUG_ON | ||
| 3165 | static void debug_loser(synode_no x) { | ||
| 3166 | if (!IS_XCOM_DEBUG_WITH(XCOM_DEBUG_TRACE)) return; | ||
| 3167 | if (1 || x.msgno < 10) { | ||
| 3168 | GET_GOUT; | ||
| 3169 | NDBG(get_nodeno(find_site_def(x)), u); | ||
| 3170 | STRLIT(" ignoring loser "); | ||
| 3171 | SYCEXP(x); | ||
| 3172 | SYCEXP(max_synode); | ||
| 3173 | PRINT_GOUT; | ||
| 3174 | FREE_GOUT; | ||
| 3175 | } | ||
| 3176 | } | ||
| 3177 | #else | ||
| 3178 | /* purecov: begin deadcode */ | ||
| 3179 | ✗ | static void debug_loser(synode_no x [[maybe_unused]]) {} | |
| 3180 | /* purecov: end */ | ||
| 3181 | #endif | ||
| 3182 | |||
| 3183 | 32785 | static void send_value(site_def const *site, node_no to, synode_no synode) { | |
| 3184 | 32785 | pax_machine *pm = get_cache(synode); | |
| 3185 |
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|
32785 | if (pm && pm->learner.msg) { |
| 3186 |
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|
30083 | pax_msg *msg = clone_pax_msg(pm->learner.msg); |
| 3187 |
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|
30083 | if (msg == nullptr) return; |
| 3188 |
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|
30083 | ref_msg(msg); |
| 3189 |
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|
30083 | send_server_msg(site, to, msg); |
| 3190 |
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|
30083 | unref_msg(&msg); |
| 3191 | } | ||
| 3192 | } | ||
| 3193 | |||
| 3194 | /** | ||
| 3195 | * Returns the message number where it is safe for nodes in previous | ||
| 3196 | * configuration to exit. | ||
| 3197 | * | ||
| 3198 | * @param start start synod of the next configuration | ||
| 3199 | * @param event_horizon event horizon of the next configuration | ||
| 3200 | */ | ||
| 3201 | 8407 | static synode_no compute_delay(synode_no start, | |
| 3202 | xcom_event_horizon event_horizon) { | ||
| 3203 | 8407 | start.msgno += event_horizon; | |
| 3204 | 8407 | return start; | |
| 3205 | } | ||
| 3206 | |||
| 3207 | /* Push messages to all nodes which were in the previous site, but not in this | ||
| 3208 | */ | ||
| 3209 | 8830 | static void inform_removed(int index, int all) { | |
| 3210 | 8830 | site_def **sites = nullptr; | |
| 3211 | 8830 | uint32_t site_count = 0; | |
| 3212 | IFDBG(D_NONE, FN; NEXP(index, d)); | ||
| 3213 |
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|
8830 | get_all_site_defs(&sites, &site_count); |
| 3214 |
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|
8830 | while (site_count > 1 && index >= 0 && (uint32_t)(index + 1) < site_count) { |
| 3215 | 6661 | site_def *s = sites[index]; | |
| 3216 | 6661 | site_def *ps = sites[index + 1]; | |
| 3217 | |||
| 3218 | /* Compute diff and push messages */ | ||
| 3219 | IFDBG(D_NONE, FN; NDBG(index, d); PTREXP(s); if (s) SYCEXP(s->boot_key); | ||
| 3220 | PTREXP(ps); if (ps) SYCEXP(ps->boot_key)); | ||
| 3221 | |||
| 3222 |
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|
6661 | if (s && ps) { |
| 3223 | 6661 | node_no i = 0; | |
| 3224 | IFDBG(D_NONE, FN; SYCEXP(s->boot_key); SYCEXP(s->start); | ||
| 3225 | SYCEXP(ps->boot_key); SYCEXP(ps->start)); | ||
| 3226 |
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|
18995 | for (i = 0; i < ps->nodes.node_list_len; i++) { /* Loop over prev site */ |
| 3227 |
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|
18007 | if (ps->nodeno != i && |
| 3228 |
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|
5673 | !node_exists(&ps->nodes.node_list_val[i], &s->nodes)) { |
| 3229 | 1783 | synode_no synode = s->start; | |
| 3230 | 1783 | synode_no end = max_synode; | |
| 3231 |
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|
34568 | while (!synode_gt(synode, end)) { /* Loop over relevant messages */ |
| 3232 |
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|
32785 | send_value(ps, i, synode); |
| 3233 |
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|
32785 | synode = incr_synode(synode); |
| 3234 | } | ||
| 3235 | } | ||
| 3236 | } | ||
| 3237 | } | ||
| 3238 |
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|
6661 | if (!all) /* Early exit if not all configs should be examined */ |
| 3239 | 6661 | break; | |
| 3240 | ✗ | index--; | |
| 3241 | } | ||
| 3242 | 8830 | } | |
| 3243 | |||
| 3244 | ✗ | static bool_t backwards_compatible(xcom_event_horizon event_horizon) { | |
| 3245 | ✗ | return event_horizon == EVENT_HORIZON_MIN; | |
| 3246 | } | ||
| 3247 | |||
| 3248 | static xcom_proto const first_event_horizon_aware_protocol = x_1_4; | ||
| 3249 | |||
| 3250 | 3448 | static bool_t reconfigurable_event_horizon(xcom_proto protocol_version) { | |
| 3251 | 3448 | return protocol_version >= first_event_horizon_aware_protocol; | |
| 3252 | } | ||
| 3253 | |||
| 3254 | 1673 | static bool_t add_node_unsafe_against_ipv4_old_nodes(app_data_ptr a) { | |
| 3255 |
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|
1673 | assert(a->body.c_t == add_node_type); |
| 3256 | |||
| 3257 | { | ||
| 3258 | 1673 | site_def const *latest_config = get_site_def(); | |
| 3259 |
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|
1673 | if (latest_config && latest_config->x_proto >= minimum_ipv6_version()) |
| 3260 | 1673 | return FALSE; | |
| 3261 | |||
| 3262 | { | ||
| 3263 | ✗ | u_int const nr_nodes_to_add = a->body.app_u_u.nodes.node_list_len; | |
| 3264 | ✗ | node_address *nodes_to_add = a->body.app_u_u.nodes.node_list_val; | |
| 3265 | |||
| 3266 | u_int i; | ||
| 3267 | ✗ | xcom_port node_port = 0; | |
| 3268 | char node_addr[IP_MAX_SIZE]; | ||
| 3269 | |||
| 3270 | ✗ | for (i = 0; i < nr_nodes_to_add; i++) { | |
| 3271 | ✗ | if (get_ip_and_port(nodes_to_add[i].address, node_addr, &node_port)) { | |
| 3272 | ✗ | G_ERROR( | |
| 3273 | "Error parsing address from a joining node. Join operation " | ||
| 3274 | "will be " | ||
| 3275 | "rejected"); | ||
| 3276 | ✗ | return TRUE; | |
| 3277 | } | ||
| 3278 | |||
| 3279 | ✗ | if (!is_node_v4_reachable(node_addr)) return TRUE; | |
| 3280 | } | ||
| 3281 | } | ||
| 3282 | |||
| 3283 | ✗ | return FALSE; | |
| 3284 | } | ||
| 3285 | } | ||
| 3286 | |||
| 3287 | /** | ||
| 3288 | * @brief This will test if we are receiving a boot request that contains | ||
| 3289 | * ourselves. This could happed in case of a misconfiguration of a | ||
| 3290 | * local_address, that causes an add_node request to be erroneous | ||
| 3291 | * delivered. | ||
| 3292 | * | ||
| 3293 | * @param a app_data with an add node request | ||
| 3294 | * @return bool_t TRUE in case of error, meaning that my address is in the | ||
| 3295 | * add_node list | ||
| 3296 | */ | ||
| 3297 | ✗ | static bool_t add_node_adding_own_address(app_data_ptr a) { | |
| 3298 | ✗ | assert(a->body.c_t == add_node_type); | |
| 3299 | |||
| 3300 | ✗ | return node_exists(cfg_app_xcom_get_identity(), &a->body.app_u_u.nodes); | |
| 3301 | } | ||
| 3302 | |||
| 3303 | /** | ||
| 3304 | * Check if a node is compatible with the group's event horizon. | ||
| 3305 | * | ||
| 3306 | * A node is compatible with the group's configuration if: | ||
| 3307 | * | ||
| 3308 | * a) The node supports event horizon reconfigurations, or | ||
| 3309 | * b) The group's event horizon is, or is scheduled to be, the default | ||
| 3310 | * event horizon. | ||
| 3311 | */ | ||
| 3312 | 3420 | static bool unsafe_against_event_horizon(node_address const *node) { | |
| 3313 | 3420 | site_def const *latest_config = get_site_def(); | |
| 3314 | 3420 | xcom_proto node_max_protocol_version = node->proto.max_proto; | |
| 3315 | bool const compatible = | ||
| 3316 |
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|
3420 | reconfigurable_event_horizon(node_max_protocol_version) || |
| 3317 | ✗ | backwards_compatible(latest_config->event_horizon); | |
| 3318 | |||
| 3319 |
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|
3420 | if (!compatible) { |
| 3320 | /* | ||
| 3321 | * The node that wants to join does not support event horizon | ||
| 3322 | * reconfigurations and the group's event horizon is, or is scheduled to | ||
| 3323 | * be, different from the default. | ||
| 3324 | * The node can not safely join the group so we deny its attempt to join. | ||
| 3325 | */ | ||
| 3326 | ✗ | G_INFO( | |
| 3327 | "%s's request to join the group was rejected because the group's " | ||
| 3328 | "event " | ||
| 3329 | "horizon is, or will be %" PRIu32 " and %s only supports %" PRIu32, | ||
| 3330 | node->address, latest_config->event_horizon, node->address, | ||
| 3331 | EVENT_HORIZON_MIN); | ||
| 3332 | ✗ | return true; | |
| 3333 | } | ||
| 3334 | 3420 | return false; | |
| 3335 | } | ||
| 3336 | |||
| 3337 | typedef bool (*unsafe_node_check)(node_address const *node); | ||
| 3338 | |||
| 3339 | 10308 | static bool check_if_add_node_is_unsafe(app_data_ptr a, | |
| 3340 | unsafe_node_check unsafe) { | ||
| 3341 |
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|
10308 | assert(a->body.c_t == add_node_type); |
| 3342 | { | ||
| 3343 | 10308 | u_int nodes_len = a->body.app_u_u.nodes.node_list_len; | |
| 3344 | 10308 | node_address *nodes_to_add = a->body.app_u_u.nodes.node_list_val; | |
| 3345 | u_int i; | ||
| 3346 |
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|
20604 | for (i = 0; i < nodes_len; i++) { |
| 3347 |
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|
10302 | if (unsafe(&nodes_to_add[i])) return true; |
| 3348 | } | ||
| 3349 | } | ||
| 3350 | 10302 | return false; | |
| 3351 | } | ||
| 3352 | |||
| 3353 | 3420 | static bool check_if_add_node_is_unsafe_against_event_horizon(app_data_ptr a) { | |
| 3354 | 3420 | return check_if_add_node_is_unsafe(a, unsafe_against_event_horizon); | |
| 3355 | } | ||
| 3356 | |||
| 3357 | // Map values of old node set to new node set by matching on | ||
| 3358 | // node addresses | ||
| 3359 | 13145 | void recompute_node_set(node_set const *old_set, node_list const *old_nodes, | |
| 3360 | node_set *new_set, node_list const *new_nodes) { | ||
| 3361 | // Return value of node set matching node_address na | ||
| 3362 | 19662 | auto value{[&](node_address const *na) { | |
| 3363 |
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|
19662 | assert(old_set->node_set_len == old_nodes->node_list_len); |
| 3364 |
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|
34550 | for (u_int i = 0; i < old_nodes->node_list_len; i++) { |
| 3365 |
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|
31056 | if (match_node(&old_nodes->node_list_val[i], na, true)) { |
| 3366 | 16168 | return old_set->node_set_val[i]; | |
| 3367 | } | ||
| 3368 | } | ||
| 3369 | 3494 | return 0; | |
| 3370 | 13145 | }}; | |
| 3371 | |||
| 3372 |
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|
32807 | for (u_int i = 0; i < new_nodes->node_list_len; i++) { |
| 3373 |
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|
19662 | new_set->node_set_val[i] = value(&new_nodes->node_list_val[i]); |
| 3374 | } | ||
| 3375 | 13145 | } | |
| 3376 | |||
| 3377 | // Remap old global and local node set of site to new | ||
| 3378 | 6568 | static void recompute_node_sets(site_def const *old_site, site_def *new_site) { | |
| 3379 | 6568 | recompute_node_set(&old_site->global_node_set, &old_site->nodes, | |
| 3380 | 6568 | &new_site->global_node_set, &new_site->nodes); | |
| 3381 | 6568 | recompute_node_set(&old_site->local_node_set, &old_site->nodes, | |
| 3382 | 6568 | &new_site->local_node_set, &new_site->nodes); | |
| 3383 | 6568 | } | |
| 3384 | |||
| 3385 | 3608 | static bool incompatible_proto_and_max_leaders(xcom_proto x_proto, | |
| 3386 | node_no max_leaders) { | ||
| 3387 |
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|
3608 | return x_proto < single_writer_support && max_leaders != active_leaders_all; |
| 3388 | } | ||
| 3389 | |||
| 3390 | 3632 | static bool incompatible_proto_and_leaders(xcom_proto x_proto) { | |
| 3391 | 3632 | return x_proto < single_writer_support; | |
| 3392 | } | ||
| 3393 | |||
| 3394 | 3444 | static bool incompatible_proto_and_max_leaders(node_address const *node) { | |
| 3395 | 3444 | site_def const *latest_config = get_site_def(); | |
| 3396 | |||
| 3397 |
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|
3444 | if (incompatible_proto_and_max_leaders(node->proto.max_proto, |
| 3398 | 3444 | latest_config->max_active_leaders)) { | |
| 3399 | /* | ||
| 3400 | * The node that wants to join does not allow setting of max number of | ||
| 3401 | * leaders | ||
| 3402 | * and the max number of leaders in the group is not all. | ||
| 3403 | * The node can not safely join the group so we deny its attempt to join. | ||
| 3404 | */ | ||
| 3405 |
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|
6 | G_INFO( |
| 3406 | "%s's request to join the group was rejected because the group's max " | ||
| 3407 | "number of active leaders is, or will be %" PRIu32 | ||
| 3408 | " and %s only supports " | ||
| 3409 | "all nodes as leaders", | ||
| 3410 | node->address, latest_config->max_active_leaders, node->address); | ||
| 3411 | 6 | return true; | |
| 3412 | } | ||
| 3413 | 3438 | return false; | |
| 3414 | } | ||
| 3415 | |||
| 3416 | 3438 | static bool incompatible_proto_and_leaders(node_address const *node) { | |
| 3417 | 3438 | site_def const *latest_config = get_site_def(); | |
| 3418 | |||
| 3419 |
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|
3444 | if (incompatible_proto_and_leaders(node->proto.max_proto) && |
| 3420 | 6 | leaders_set_by_client(latest_config)) { | |
| 3421 | /* | ||
| 3422 | * The node that wants to join does not allow changing the set of | ||
| 3423 | * leaders | ||
| 3424 | * and the set of leaders in the group is not empty. | ||
| 3425 | * The node can not safely join the group so we deny its attempt to join. | ||
| 3426 | */ | ||
| 3427 | ✗ | G_INFO( | |
| 3428 | "%s's request to join the group was rejected because the group " | ||
| 3429 | "has a non-empty set of leaders specified by the client, " | ||
| 3430 | "and %s does not support changing the set of leaders", | ||
| 3431 | node->address, node->address); | ||
| 3432 | ✗ | return true; | |
| 3433 | } | ||
| 3434 | 3438 | return false; | |
| 3435 | } | ||
| 3436 | |||
| 3437 | 3447 | bool unsafe_leaders(app_data *a) { | |
| 3438 |
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|
6888 | return check_if_add_node_is_unsafe(a, incompatible_proto_and_max_leaders) || |
| 3439 |
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|
6888 | check_if_add_node_is_unsafe(a, incompatible_proto_and_leaders); |
| 3440 | } | ||
| 3441 | |||
| 3442 | 5955 | static void set_start_and_boot(site_def *new_config, app_data_ptr a) { | |
| 3443 | 5955 | new_config->start = getstart(a); | |
| 3444 | 5955 | new_config->boot_key = a->app_key; | |
| 3445 | 5955 | } | |
| 3446 | |||
| 3447 | // Map values of old timestamps to new timestamps by matching on | ||
| 3448 | // node addresses | ||
| 3449 | 6577 | void recompute_timestamps(detector_state const old_timestamp, | |
| 3450 | node_list const *old_nodes, | ||
| 3451 | detector_state new_timestamp, | ||
| 3452 | node_list const *new_nodes) { | ||
| 3453 | // Return value of timestamp matching node_address na | ||
| 3454 | 9837 | auto value{[&](node_address const *na) { | |
| 3455 |
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|
17284 | for (u_int i = 0; i < old_nodes->node_list_len; i++) { |
| 3456 |
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|
15537 | if (match_node(&old_nodes->node_list_val[i], na, true)) { |
| 3457 | 8090 | return old_timestamp[i]; | |
| 3458 | } | ||
| 3459 | } | ||
| 3460 | 1747 | return 0.0; | |
| 3461 | 6577 | }}; | |
| 3462 | |||
| 3463 |
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|
16414 | for (u_int i = 0; i < new_nodes->node_list_len; i++) { |
| 3464 |
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|
9837 | new_timestamp[i] = value(&new_nodes->node_list_val[i]); |
| 3465 | } | ||
| 3466 | 6577 | } | |
| 3467 | |||
| 3468 | /** | ||
| 3469 | * Reconfigure the group membership: add new member(s). | ||
| 3470 | * | ||
| 3471 | * It is possible that concurrent reconfigurations take effect between the | ||
| 3472 | * time this reconfiguration was proposed and now. | ||
| 3473 | * | ||
| 3474 | * Particularly, it is possible that any of the concurrent reconfigurations | ||
| 3475 | * modified the event horizon and that the new member(s) do not support event | ||
| 3476 | * horizon reconfigurations. | ||
| 3477 | * | ||
| 3478 | * We account for these situations by validating if adding the new members is | ||
| 3479 | * still possible under the current state. | ||
| 3480 | * | ||
| 3481 | * If it is not, this reconfiguration does not produce any effect, i.e. no new | ||
| 3482 | * configuration is installed. | ||
| 3483 | */ | ||
| 3484 | 1747 | site_def *handle_add_node(app_data_ptr a) { | |
| 3485 |
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|
1747 | if (check_if_add_node_is_unsafe_against_event_horizon(a)) { |
| 3486 | /* | ||
| 3487 | * Note that the result of this function is only applicable to | ||
| 3488 | * unused and not-fully-implemented code paths where add_node_type is used | ||
| 3489 | * forcibly. | ||
| 3490 | * Should this fact change, this obviously does not work. | ||
| 3491 | */ | ||
| 3492 | ✗ | return nullptr; | |
| 3493 | } | ||
| 3494 | |||
| 3495 |
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|
1747 | if (unsafe_leaders(a)) { |
| 3496 | ✗ | return nullptr; | |
| 3497 | } | ||
| 3498 | { | ||
| 3499 |
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|
3494 | for (u_int node = 0; node < a->body.app_u_u.nodes.node_list_len; node++) { |
| 3500 |
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|
1747 | G_INFO("Adding new node to the configuration: %s", |
| 3501 | a->body.app_u_u.nodes.node_list_val[node].address) | ||
| 3502 | } | ||
| 3503 | |||
| 3504 | 1747 | site_def const *old_site = get_site_def(); | |
| 3505 | 1747 | site_def *site = clone_site_def(old_site); | |
| 3506 | IFDBG(D_NONE, FN; COPY_AND_FREE_GOUT(dbg_list(&a->body.app_u_u.nodes));); | ||
| 3507 | IFDBG(D_NONE, FN; COPY_AND_FREE_GOUT(dbg_list(&a->body.app_u_u.nodes));); | ||
| 3508 | ADD_DBG(D_BASE, add_event(EVENT_DUMP_PAD, string_arg("a->app_key")); | ||
| 3509 | add_synode_event(a->app_key);); | ||
| 3510 |
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|
1747 | assert(old_site); |
| 3511 |
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|
1747 | assert(site); |
| 3512 | 1747 | add_site_def(a->body.app_u_u.nodes.node_list_len, | |
| 3513 | a->body.app_u_u.nodes.node_list_val, site); | ||
| 3514 | 1747 | set_start_and_boot(site, a); | |
| 3515 |
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|
1747 | if (site->x_proto >= single_writer_support) { |
| 3516 | 1747 | recompute_node_sets(old_site, site); | |
| 3517 | 1747 | recompute_timestamps(old_site->detected, &old_site->nodes, site->detected, | |
| 3518 | 1747 | &site->nodes); | |
| 3519 | } | ||
| 3520 | 1747 | site_install_action(site, a->body.c_t); | |
| 3521 | 1747 | return site; | |
| 3522 | } | ||
| 3523 | } | ||
| 3524 | |||
| 3525 | /** | ||
| 3526 | * Check if we can reconfigure the event horizon. | ||
| 3527 | * | ||
| 3528 | * We can reconfigure the event horizon if all group members support | ||
| 3529 | * reconfiguring the event horizon, and the new event horizon in the domain | ||
| 3530 | * [EVENT_HORIZON_MIN, EVENT_HORIZON_MAX]. | ||
| 3531 | * | ||
| 3532 | * We use the group's latest common XCom protocol as a proxy to decide if all | ||
| 3533 | * members support reconfiguring the event horizon. | ||
| 3534 | * | ||
| 3535 | * If the common protocol is at least version 5 (x_1_4) then all members run | ||
| 3536 | * compatible server instances. | ||
| 3537 | * | ||
| 3538 | * Otherwise there are older instances, and it follows that the event horizon | ||
| 3539 | * must be the default and cannot be reconfigured. | ||
| 3540 | */ | ||
| 3541 | enum allow_event_horizon_result { | ||
| 3542 | EVENT_HORIZON_ALLOWED, | ||
| 3543 | EVENT_HORIZON_INVALID, | ||
| 3544 | EVENT_HORIZON_UNCHANGEABLE | ||
| 3545 | }; | ||
| 3546 | typedef enum allow_event_horizon_result allow_event_horizon_result; | ||
| 3547 | |||
| 3548 | ✗ | static void log_event_horizon_reconfiguration_failure( | |
| 3549 | allow_event_horizon_result error_code, | ||
| 3550 | xcom_event_horizon attempted_event_horizon) { | ||
| 3551 | ✗ | switch (error_code) { | |
| 3552 | ✗ | case EVENT_HORIZON_INVALID: | |
| 3553 | ✗ | G_WARNING("The event horizon was not reconfigured to %" PRIu32 | |
| 3554 | "because its domain is [%" PRIu32 ", %" PRIu32 "]", | ||
| 3555 | attempted_event_horizon, xcom_get_minimum_event_horizon(), | ||
| 3556 | xcom_get_maximum_event_horizon()); | ||
| 3557 | ✗ | break; | |
| 3558 | ✗ | case EVENT_HORIZON_UNCHANGEABLE: | |
| 3559 | ✗ | G_WARNING("The event horizon was not reconfigured to %" PRIu32 | |
| 3560 | " because some of the group's members do not support " | ||
| 3561 | "reconfiguring the event horizon", | ||
| 3562 | attempted_event_horizon); | ||
| 3563 | ✗ | break; | |
| 3564 | ✗ | case EVENT_HORIZON_ALLOWED: | |
| 3565 | ✗ | break; | |
| 3566 | } | ||
| 3567 | } | ||
| 3568 | |||
| 3569 | 28 | static allow_event_horizon_result allow_event_horizon( | |
| 3570 | xcom_event_horizon event_horizon) { | ||
| 3571 |
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|
28 | if (event_horizon < EVENT_HORIZON_MIN || event_horizon > EVENT_HORIZON_MAX) |
| 3572 | ✗ | return EVENT_HORIZON_INVALID; | |
| 3573 | |||
| 3574 | { | ||
| 3575 | 28 | const site_def *latest_config = get_site_def(); | |
| 3576 |
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|
28 | if (!reconfigurable_event_horizon(latest_config->x_proto)) { |
| 3577 | ✗ | assert(backwards_compatible(latest_config->event_horizon)); | |
| 3578 | ✗ | return EVENT_HORIZON_UNCHANGEABLE; | |
| 3579 | } | ||
| 3580 | } | ||
| 3581 | 28 | return EVENT_HORIZON_ALLOWED; | |
| 3582 | } | ||
| 3583 | |||
| 3584 | 28 | static bool_t is_unsafe_event_horizon_reconfiguration(app_data_ptr a) { | |
| 3585 |
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|
28 | assert(a->body.c_t == set_event_horizon_type); |
| 3586 | { | ||
| 3587 | 28 | xcom_event_horizon new_event_horizon = a->body.app_u_u.event_horizon; | |
| 3588 | 28 | bool_t result = FALSE; | |
| 3589 | allow_event_horizon_result error_code; | ||
| 3590 | 28 | error_code = allow_event_horizon(new_event_horizon); | |
| 3591 |
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|
28 | switch (error_code) { |
| 3592 | ✗ | case EVENT_HORIZON_INVALID: | |
| 3593 | case EVENT_HORIZON_UNCHANGEABLE: | ||
| 3594 | ✗ | log_event_horizon_reconfiguration_failure(error_code, | |
| 3595 | new_event_horizon); | ||
| 3596 | ✗ | result = TRUE; | |
| 3597 | ✗ | break; | |
| 3598 | 28 | case EVENT_HORIZON_ALLOWED: | |
| 3599 | 28 | break; | |
| 3600 | } | ||
| 3601 | 28 | return result; | |
| 3602 | } | ||
| 3603 | } | ||
| 3604 | |||
| 3605 | // Predicate that checks IF the reconfiguration will be unsafe | ||
| 3606 | 182 | static bool_t is_unsafe_max_leaders_reconfiguration(app_data_ptr a) { | |
| 3607 |
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|
182 | assert(a->body.c_t == set_max_leaders); |
| 3608 | 182 | const site_def *latest_config = get_site_def(); | |
| 3609 | 182 | node_no new_max_leaders = a->body.app_u_u.max_leaders; | |
| 3610 |
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|
182 | if (new_max_leaders > get_maxnodes(latest_config)) { |
| 3611 |
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|
18 | G_WARNING("The max number of leaders was not reconfigured to %" PRIu32 |
| 3612 | " because its domain is [%" PRIu32 ", %" PRIu32 "]", | ||
| 3613 | new_max_leaders, 0, get_maxnodes(latest_config)); | ||
| 3614 | 18 | return TRUE; | |
| 3615 |
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|
164 | } else if (incompatible_proto_and_max_leaders(latest_config->x_proto, |
| 3616 | new_max_leaders)) { | ||
| 3617 |
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|
6 | G_WARNING( |
| 3618 | "The max number of leaders was not reconfigured " | ||
| 3619 | " because some of the group's members do not support " | ||
| 3620 | "reconfiguring the max number of leaders to %" PRIu32, | ||
| 3621 | new_max_leaders); | ||
| 3622 | 6 | return TRUE; | |
| 3623 | } else { | ||
| 3624 | 158 | return FALSE; | |
| 3625 | } | ||
| 3626 | } | ||
| 3627 | |||
| 3628 | 194 | static bool_t is_unsafe_set_leaders_reconfiguration(app_data_ptr a | |
| 3629 | [[maybe_unused]]) { | ||
| 3630 |
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|
194 | assert(a->body.c_t == set_leaders_type); |
| 3631 | 194 | const site_def *latest_config = get_site_def(); | |
| 3632 |
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|
194 | if (incompatible_proto_and_leaders(latest_config->x_proto)) { |
| 3633 |
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|
27 | G_WARNING( |
| 3634 | "The set of leaders was not reconfigured " | ||
| 3635 | " because some of the group's members do not support " | ||
| 3636 | "reconfiguring leaders"); | ||
| 3637 | 27 | return TRUE; | |
| 3638 | } else { | ||
| 3639 | 167 | return FALSE; | |
| 3640 | } | ||
| 3641 | } | ||
| 3642 | |||
| 3643 | 179 | static bool_t is_unsafe_leaders_reconfiguration(app_data_ptr a) { | |
| 3644 |
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|
489 | while (a) { |
| 3645 |
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|
340 | switch (a->body.c_t) { |
| 3646 | 161 | case set_max_leaders: | |
| 3647 |
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|
161 | if (is_unsafe_max_leaders_reconfiguration(a)) return TRUE; |
| 3648 | 149 | break; | |
| 3649 | 179 | case set_leaders_type: | |
| 3650 |
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|
179 | if (is_unsafe_set_leaders_reconfiguration(a)) return TRUE; |
| 3651 | 161 | break; | |
| 3652 | ✗ | default: | |
| 3653 | ✗ | break; | |
| 3654 | } | ||
| 3655 | 310 | a = a->next; | |
| 3656 | } | ||
| 3657 | 149 | return FALSE; | |
| 3658 | } | ||
| 3659 | |||
| 3660 | 28 | static bool_t are_there_dead_nodes_in_new_config(app_data_ptr a) { | |
| 3661 |
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|
28 | assert(a->body.c_t == force_config_type); |
| 3662 | |||
| 3663 | { | ||
| 3664 | 28 | u_int nr_nodes_to_add = a->body.app_u_u.nodes.node_list_len; | |
| 3665 | 28 | node_address *nodes_to_change = a->body.app_u_u.nodes.node_list_val; | |
| 3666 | uint32_t i; | ||
| 3667 |
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|
28 | G_DEBUG("Checking for dead nodes in Forced Configuration") |
| 3668 |
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|
58 | for (i = 0; i < nr_nodes_to_add; i++) { |
| 3669 | 31 | node_no node = find_nodeno(get_site_def(), nodes_to_change[i].address); | |
| 3670 | |||
| 3671 |
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|
31 | if (node == get_nodeno(get_site_def())) |
| 3672 | 27 | continue; /* No need to validate myself */ | |
| 3673 | |||
| 3674 |
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|
4 | if (node == VOID_NODE_NO) { |
| 3675 | ✗ | G_ERROR( | |
| 3676 | "%s is not in the current configuration." | ||
| 3677 | "Only members in the current configuration can be present" | ||
| 3678 | " in a forced configuration list", | ||
| 3679 | nodes_to_change[i].address) | ||
| 3680 | ✗ | return TRUE; | |
| 3681 | } | ||
| 3682 | |||
| 3683 |
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|
4 | if (may_be_dead(get_site_def()->detected, node, task_now())) { |
| 3684 |
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|
1 | G_ERROR( |
| 3685 | "%s is suspected to be failed." | ||
| 3686 | "Only alive members in the current configuration should be " | ||
| 3687 | "present" | ||
| 3688 | " in a forced configuration list", | ||
| 3689 | nodes_to_change[i].address) | ||
| 3690 | 1 | return TRUE; | |
| 3691 | } | ||
| 3692 | } | ||
| 3693 | } | ||
| 3694 | |||
| 3695 | 27 | return FALSE; | |
| 3696 | } | ||
| 3697 | |||
| 3698 | /** | ||
| 3699 | * Reconfigure the event horizon. | ||
| 3700 | * | ||
| 3701 | * It is possible that concurrent reconfigurations take effect between the | ||
| 3702 | * time this reconfiguration was proposed and now. | ||
| 3703 | * | ||
| 3704 | * Particularly, it is possible that any of the concurrent reconfigurations | ||
| 3705 | * added a new member which does not support reconfiguring the event | ||
| 3706 | * horizon. | ||
| 3707 | * | ||
| 3708 | * We account for these situations by validating if the event horizon | ||
| 3709 | * reconfiguration is still possible under the current state. | ||
| 3710 | * | ||
| 3711 | * If it is not, this reconfiguration does not produce any effect, i.e. no | ||
| 3712 | * new configuration is installed. | ||
| 3713 | */ | ||
| 3714 | 19 | bool_t handle_event_horizon(app_data_ptr a) { | |
| 3715 |
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|
19 | if (is_unsafe_event_horizon_reconfiguration(a)) return FALSE; |
| 3716 | |||
| 3717 | { | ||
| 3718 | 19 | xcom_event_horizon new_event_horizon = a->body.app_u_u.event_horizon; | |
| 3719 | 19 | const site_def *latest_config = get_site_def(); | |
| 3720 | 19 | site_def *new_config = clone_site_def(latest_config); | |
| 3721 | IFDBG(D_NONE, FN; NDBG(new_event_horizon, u)); | ||
| 3722 | IFDBG(D_NONE, FN; NDBG(new_event_horizon, u)); | ||
| 3723 | ADD_DBG(D_BASE, add_event(EVENT_DUMP_PAD, string_arg("a->app_key")); | ||
| 3724 | add_synode_event(a->app_key);); | ||
| 3725 |
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|
19 | assert(get_site_def()); |
| 3726 |
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|
19 | assert(new_config); |
| 3727 | 19 | new_config->event_horizon = new_event_horizon; | |
| 3728 | 19 | set_start_and_boot(new_config, a); | |
| 3729 | 19 | site_install_action(new_config, a->body.c_t); | |
| 3730 |
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|
19 | G_INFO("The event horizon was reconfigured to %" PRIu32, new_event_horizon); |
| 3731 | } | ||
| 3732 | 19 | return TRUE; | |
| 3733 | } | ||
| 3734 | |||
| 3735 | 119 | static bool_t handle_max_leaders(site_def *new_config, app_data_ptr a) { | |
| 3736 | IFDBG(D_BASE, FN; NUMEXP(a->body.app_u_u.max_leaders)); | ||
| 3737 |
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|
119 | assert(new_config); |
| 3738 | 119 | new_config->max_active_leaders = a->body.app_u_u.max_leaders; | |
| 3739 | 119 | set_start_and_boot(new_config, a); | |
| 3740 |
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|
119 | G_INFO("Maximum number of leaders was reconfigured to %" PRIu32, |
| 3741 | a->body.app_u_u.max_leaders); | ||
| 3742 | 119 | return TRUE; | |
| 3743 | } | ||
| 3744 | |||
| 3745 | 21 | bool_t handle_max_leaders(app_data_ptr a) { | |
| 3746 |
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|
21 | if (is_unsafe_max_leaders_reconfiguration(a)) return FALSE; |
| 3747 | |||
| 3748 | 9 | site_def *new_config = clone_site_def(get_site_def()); | |
| 3749 | 9 | handle_max_leaders(new_config, a); | |
| 3750 | 9 | site_install_action(new_config, a->body.c_t); | |
| 3751 | 9 | return TRUE; | |
| 3752 | } | ||
| 3753 | |||
| 3754 | 116 | static void zero_leader_array(leader_array *l) { | |
| 3755 | 116 | l->leader_array_len = 0; | |
| 3756 | 116 | l->leader_array_val = nullptr; | |
| 3757 | 116 | } | |
| 3758 | |||
| 3759 | 116 | static void move_leader_array(leader_array *target, leader_array *source) { | |
| 3760 | /* Deallocate leader_array from target */ | ||
| 3761 | 116 | xdr_free((xdrproc_t)xdr_leader_array, (char *)target); | |
| 3762 | 116 | *target = *source; | |
| 3763 | /* Zero the source */ | ||
| 3764 | 116 | zero_leader_array(source); | |
| 3765 | 116 | } | |
| 3766 | |||
| 3767 | 116 | static bool_t handle_set_leaders(site_def *new_config, app_data_ptr a) { | |
| 3768 | IFDBG(D_BASE, FN; NUMEXP(a->body.app_u_u.leaders.leader_array_len); | ||
| 3769 | NUMEXP(new_config->max_active_leaders)); | ||
| 3770 |
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|
116 | assert(new_config); |
| 3771 | /* Steal the leaders from a */ | ||
| 3772 | 116 | move_leader_array(&new_config->leaders, &a->body.app_u_u.leaders); | |
| 3773 | 116 | set_start_and_boot(new_config, a); | |
| 3774 | 116 | return TRUE; | |
| 3775 | } | ||
| 3776 | |||
| 3777 | 15 | bool_t handle_set_leaders(app_data_ptr a) { | |
| 3778 |
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|
15 | if (is_unsafe_set_leaders_reconfiguration(a)) return FALSE; |
| 3779 | |||
| 3780 | 6 | site_def *new_config = clone_site_def(get_site_def()); | |
| 3781 | 6 | handle_set_leaders(new_config, a); | |
| 3782 | 6 | site_install_action(new_config, a->body.c_t); | |
| 3783 |
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|
6 | G_INFO("Preferred leaders were reconfigured to leaders[0]=%s", |
| 3784 | new_config->leaders.leader_array_len > 0 | ||
| 3785 | ? new_config->leaders.leader_array_val[0].address | ||
| 3786 | : "n/a"); | ||
| 3787 | 6 | return TRUE; | |
| 3788 | } | ||
| 3789 | |||
| 3790 | 140 | bool_t handle_leaders(app_data_ptr a) { | |
| 3791 |
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|
140 | if (is_unsafe_leaders_reconfiguration(a)) return FALSE; |
| 3792 | 110 | site_def *new_config = clone_site_def(get_site_def()); | |
| 3793 | 110 | cargo_type operation{a->body.c_t}; // Deallocate on scope exit if failure | |
| 3794 | 110 | bool_t retval = TRUE; | |
| 3795 |
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|
330 | while (a && retval) { |
| 3796 |
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|
220 | switch (a->body.c_t) { |
| 3797 | 110 | case set_max_leaders: | |
| 3798 |
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|
110 | if (!handle_max_leaders(new_config, a)) retval = FALSE; |
| 3799 | 110 | break; | |
| 3800 | 110 | case set_leaders_type: | |
| 3801 |
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|
110 | if (!handle_set_leaders(new_config, a)) retval = FALSE; |
| 3802 | 110 | break; | |
| 3803 | ✗ | default: | |
| 3804 | ✗ | break; | |
| 3805 | } | ||
| 3806 | 220 | a = a->next; | |
| 3807 | } | ||
| 3808 |
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|
110 | if (retval) { |
| 3809 | 110 | site_install_action(new_config, operation); | |
| 3810 | } else { | ||
| 3811 | ✗ | free_site_def(new_config); | |
| 3812 | } | ||
| 3813 | 110 | return retval; | |
| 3814 | } | ||
| 3815 | |||
| 3816 | 2348 | void terminate_and_exit() { | |
| 3817 | IFDBG(D_NONE, FN;); | ||
| 3818 | ADD_DBG(D_FSM, add_event(EVENT_DUMP_PAD, string_arg("terminating"));) | ||
| 3819 |
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|
2348 | XCOM_FSM(x_fsm_terminate, int_arg(0)); /* Tell xcom to stop */ |
| 3820 |
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|
2348 | XCOM_FSM(x_fsm_exit, int_arg(0)); /* Tell xcom to exit */ |
| 3821 |
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|
2348 | if (xcom_expel_cb) xcom_expel_cb(0); |
| 3822 | 2348 | } | |
| 3823 | |||
| 3824 | 2169 | static inline int is_empty_site(site_def const *s) { | |
| 3825 | 2169 | return s->nodes.node_list_len == 0; | |
| 3826 | } | ||
| 3827 | |||
| 3828 | 3954 | site_def *handle_remove_node(app_data_ptr a) { | |
| 3829 | 3954 | site_def const *old_site = get_site_def(); | |
| 3830 | 3954 | site_def *site = clone_site_def(old_site); | |
| 3831 | IFDBG(D_NONE, FN; COPY_AND_FREE_GOUT(dbg_list(&a->body.app_u_u.nodes))); | ||
| 3832 | ADD_DBG(D_BASE, add_event(EVENT_DUMP_PAD, string_arg("a->app_key")); | ||
| 3833 | add_synode_event(a->app_key); | ||
| 3834 | add_event(EVENT_DUMP_PAD, string_arg("nodeno")); | ||
| 3835 | add_event(EVENT_DUMP_PAD, uint_arg(get_nodeno(site)));); | ||
| 3836 | |||
| 3837 | 3954 | remove_site_def(a->body.app_u_u.nodes.node_list_len, | |
| 3838 | a->body.app_u_u.nodes.node_list_val, site); | ||
| 3839 | 3954 | set_start_and_boot(site, a); | |
| 3840 |
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|
3954 | if (site->x_proto >= single_writer_support) { |
| 3841 | 3954 | recompute_node_sets(old_site, site); | |
| 3842 | 3954 | recompute_timestamps(old_site->detected, &old_site->nodes, site->detected, | |
| 3843 | 3954 | &site->nodes); | |
| 3844 | } | ||
| 3845 | 3954 | site_install_action(site, a->body.c_t); | |
| 3846 | 3954 | return site; | |
| 3847 | } | ||
| 3848 | |||
| 3849 | ✗ | static void log_ignored_forced_config(app_data_ptr a, | |
| 3850 | char const *const caller_name) { | ||
| 3851 | ✗ | switch (a->body.c_t) { | |
| 3852 | ✗ | case unified_boot_type: | |
| 3853 | ✗ | G_DEBUG("%s: Ignoring a forced intermediate, pending unified_boot", | |
| 3854 | caller_name); | ||
| 3855 | ✗ | break; | |
| 3856 | ✗ | case add_node_type: | |
| 3857 | ✗ | G_DEBUG("%s: Ignoring a forced intermediate, pending add_node for %s", | |
| 3858 | caller_name, a->body.app_u_u.nodes.node_list_val[0].address); | ||
| 3859 | ✗ | break; | |
| 3860 | ✗ | case remove_node_type: | |
| 3861 | ✗ | G_DEBUG("%s: Ignoring a forced intermediate, pending remove_node for %s", | |
| 3862 | caller_name, a->body.app_u_u.nodes.node_list_val[0].address); | ||
| 3863 | ✗ | break; | |
| 3864 | ✗ | case set_event_horizon_type: | |
| 3865 | ✗ | G_DEBUG( | |
| 3866 | "%s: Ignoring a forced intermediate, pending set_event_horizon for " | ||
| 3867 | "%" PRIu32, | ||
| 3868 | caller_name, a->body.app_u_u.event_horizon); | ||
| 3869 | ✗ | break; | |
| 3870 | ✗ | case force_config_type: | |
| 3871 | ✗ | G_DEBUG("%s: Ignoring a forced intermediate, pending force_config", | |
| 3872 | caller_name); | ||
| 3873 | ✗ | break; | |
| 3874 | ✗ | case set_max_leaders: | |
| 3875 | ✗ | G_DEBUG( | |
| 3876 | "%s: Ignoring a forced intermediate, pending set_max_leaders for " | ||
| 3877 | "%" PRIu32, | ||
| 3878 | caller_name, a->body.app_u_u.max_leaders); | ||
| 3879 | ✗ | break; | |
| 3880 | ✗ | case set_leaders_type: | |
| 3881 | ✗ | G_DEBUG("%s: Ignoring a forced intermediate, pending set_leaders_type", | |
| 3882 | caller_name); | ||
| 3883 | ✗ | break; | |
| 3884 | ✗ | case abort_trans: | |
| 3885 | case app_type: | ||
| 3886 | case begin_trans: | ||
| 3887 | case convert_into_local_server_type: | ||
| 3888 | case disable_arbitrator: | ||
| 3889 | case enable_arbitrator: | ||
| 3890 | case exit_type: | ||
| 3891 | case get_event_horizon_type: | ||
| 3892 | case get_synode_app_data_type: | ||
| 3893 | case prepared_trans: | ||
| 3894 | case remove_reset_type: | ||
| 3895 | case reset_type: | ||
| 3896 | case set_cache_limit: | ||
| 3897 | case view_msg: | ||
| 3898 | case x_terminate_and_exit: | ||
| 3899 | case xcom_boot_type: | ||
| 3900 | case xcom_set_group: | ||
| 3901 | case get_leaders_type: | ||
| 3902 | // Meaningless for any other `cargo_type`s. Ignore. | ||
| 3903 | ✗ | break; | |
| 3904 | } | ||
| 3905 | } | ||
| 3906 | |||
| 3907 | 6661 | bool_t handle_config(app_data_ptr a, bool const forced) { | |
| 3908 |
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|
6661 | assert(a->body.c_t == unified_boot_type || a->body.c_t == set_max_leaders || |
| 3909 | a->body.c_t == set_leaders_type || | ||
| 3910 | a->next == nullptr); /* Reconfiguration commands are not batched. */ | ||
| 3911 | { | ||
| 3912 | 6661 | bool_t success = FALSE; | |
| 3913 |
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|
6661 | if (forced && |
| 3914 | ✗ | should_ignore_forced_config_or_view(get_executor_site()->x_proto)) { | |
| 3915 | ✗ | log_ignored_forced_config(a, "handle_config"); | |
| 3916 | ✗ | goto end; | |
| 3917 | } | ||
| 3918 |
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|
6661 | switch (a->body.c_t) { |
| 3919 | 837 | case unified_boot_type: | |
| 3920 | 837 | success = (install_node_group(a) != nullptr); | |
| 3921 |
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|
837 | assert(success); |
| 3922 | 837 | break; | |
| 3923 | 1747 | case add_node_type: | |
| 3924 | /* | ||
| 3925 | * May fail if meanwhile the event horizon was reconfigured and the | ||
| 3926 | * node is incompatible. | ||
| 3927 | */ | ||
| 3928 | 1747 | success = (handle_add_node(a) != nullptr); | |
| 3929 | 1747 | break; | |
| 3930 | 3954 | case remove_node_type: | |
| 3931 | ADD_DBG(D_BASE, | ||
| 3932 | add_event(EVENT_DUMP_PAD, string_arg("got remove_node_type"));) | ||
| 3933 | 3954 | success = (handle_remove_node(a) != nullptr); | |
| 3934 |
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|
3954 | assert(success); |
| 3935 | 3954 | break; | |
| 3936 | 19 | case set_event_horizon_type: | |
| 3937 | /* May fail if meanwhile an incompatible node joined. */ | ||
| 3938 | 19 | success = handle_event_horizon(a); | |
| 3939 | 19 | break; | |
| 3940 | ✗ | case force_config_type: | |
| 3941 | ✗ | success = (install_node_group(a) != nullptr); | |
| 3942 | ✗ | assert(success); | |
| 3943 | ✗ | break; | |
| 3944 | 104 | case set_max_leaders: | |
| 3945 | case set_leaders_type: | ||
| 3946 | 104 | success = handle_leaders(a); | |
| 3947 |
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|
104 | assert(success); |
| 3948 | 104 | break; | |
| 3949 | ✗ | default: | |
| 3950 | ✗ | assert(FALSE); /* Boy oh boy, something is really wrong... */ | |
| 3951 | break; | ||
| 3952 | } | ||
| 3953 | 6661 | end: | |
| 3954 | 6661 | return success; | |
| 3955 | } | ||
| 3956 | } | ||
| 3957 | |||
| 3958 | 7498 | static inline int is_member(site_def const *site) { | |
| 3959 | 7498 | return site->nodeno != VOID_NODE_NO; | |
| 3960 | } | ||
| 3961 | |||
| 3962 | /* | ||
| 3963 | Execute xcom message stream. | ||
| 3964 | |||
| 3965 | Beware of the exit logic in this task, which is both simple and | ||
| 3966 | not so simple. Consider three configs C1 and C2. C1 has two | ||
| 3967 | nodes, A and B. C2 has only node B. C3 is empty. A config with | ||
| 3968 | message number N will be activated after a delay of (at least) | ||
| 3969 | alpha messages, where alpha is the size of the pipeline (or the | ||
| 3970 | event horizon). | ||
| 3971 | |||
| 3972 | So, C1.start = C1+alpha, and C2.start = C2+alpha. A, which is re‐ | ||
| 3973 | moved from C1, cannot exit until a majority of nodes in the new | ||
| 3974 | config C2 (in this case B) has learned all the messages from con‐ | ||
| 3975 | fig C1, which means all messages less than C2.start. How can A | ||
| 3976 | know that a majority of C2 has learned those messages? | ||
| 3977 | |||
| 3978 | If we denote the first message that is not yet decided (and exe‐ | ||
| 3979 | cuted) by E, the proposers will not try to propose messages with | ||
| 3980 | number >= E+alpha, and all incoming tcp messages with message | ||
| 3981 | number >= E+alpha will be ignored. E is incremented by the ex‐ | ||
| 3982 | ecutor task, so all messages < E are known. This means that when | ||
| 3983 | the value of E+alpha is known, all messages up to and including E | ||
| 3984 | are also known, although not all messages E+1..E+alpha‐1 neces‐ | ||
| 3985 | sarily are known. | ||
| 3986 | |||
| 3987 | This leads to the requirement that a node which is removed (A) | ||
| 3988 | needs to wait until it knows the value of C2.start+alpha, since | ||
| 3989 | by then it knows that a majority of the nodes in C2 are ready to | ||
| 3990 | execute C2.start, which in turn implies that a majority of nodes | ||
| 3991 | in C2 knows all the values from config C1. Note that the last | ||
| 3992 | message that should be delivered to the application by a node | ||
| 3993 | that is leaving C1 is C2.start‐1, which is the last message of | ||
| 3994 | C1. | ||
| 3995 | |||
| 3996 | How does a node that is removed get to know values from the next | ||
| 3997 | config? There are two ways, and we use both. First, the node | ||
| 3998 | that tries to exit can simply ask for the message. get_xcom_mes‐ | ||
| 3999 | sage() will do this for all messages <= max_synode, but it may | ||
| 4000 | take some time. Second, the nodes of C2 can send the messages | ||
| 4001 | C2.start..C2.start+alpha to the nodes that are removed (nodes | ||
| 4002 | that are in C1 but not in C2). inform_removed() does this. We | ||
| 4003 | take care to handle the case where configs are close enough that | ||
| 4004 | C0 < C1 <= C0+alpha by tracking the oldest config that contains | ||
| 4005 | nodes that are leaving. | ||
| 4006 | |||
| 4007 | This takes care of nodes leaving C1. What about nodes that leave | ||
| 4008 | C2? C3 is empty, so B, which is leaving C2, cannot wait for mes‐ | ||
| 4009 | sages from C3. But since C3 is empty, there is no need to wait. | ||
| 4010 | It can exit immediately after having executed C3.start‐1, the | ||
| 4011 | last message of C2. What if C3.start‐1 < C2.start+alpha? This can | ||
| 4012 | happen if C2 and C3 are close. In that case, B will exit before A | ||
| 4013 | gets the chance to learn C2.start+alpha, which will leave A hang‐ | ||
| 4014 | ing forever. Clearly, we need to impose an additional constraint, | ||
| 4015 | that C3.start must be greater than C2.start+alpha. This is taken | ||
| 4016 | care of by the special test for an empty config. | ||
| 4017 | |||
| 4018 | Complicated and confusing? Not really, but there is a clean and | ||
| 4019 | simple solution which has not been implemented yet, since it re‐ | ||
| 4020 | quires more changes to the consensus logic. If we require that | ||
| 4021 | for the messages C2..C2.start‐1 we have a majority from both the | ||
| 4022 | nodes in C1 and the nodes in C2, the nodes not in C2 can exit | ||
| 4023 | when they have executed message C2.start‐1, since we then know | ||
| 4024 | that a majority of the nodes of C2 has agreed on those messages | ||
| 4025 | as well, so they do not depend on the nodes not in C2 any more. | ||
| 4026 | This holds even if C2 is empty. Note that requiring a majority | ||
| 4027 | from both C1 and C2 is different from requiring a majority from | ||
| 4028 | C1+C2, which means that the proposer logic needs to consider an‐ | ||
| 4029 | swers from two different sets of acceptors for those messages. | ||
| 4030 | Since acceptors are identified by their node number, and the node | ||
| 4031 | numbers need not be the same for both configs, we need to main‐ | ||
| 4032 | tain a mapping between the nodes numbers of any two consecutive | ||
| 4033 | configs. Alternatively, we could remove the node numbers alto‐ | ||
| 4034 | gether, and always use a unique, unchanging ID for a node, like | ||
| 4035 | IP address + port. | ||
| 4036 | |||
| 4037 | TODO: | ||
| 4038 | |||
| 4039 | Move the delayed delivery logic into MCM-specific code, since it is | ||
| 4040 | only needed by MCM. Is it still needed? | ||
| 4041 | |||
| 4042 | Rewrite exit logic as FSM with more states. (RUN, EMPTY_EXIT, | ||
| 4043 | NOT_MEMBER_EXIT) to avoid unnecessary tests. | ||
| 4044 | |||
| 4045 | */ | ||
| 4046 | |||
| 4047 | /* FIFO which tracks the message numbers where we should deliver queued messages | ||
| 4048 | or | ||
| 4049 | inform the removed nodes */ | ||
| 4050 | #define FIFO_SIZE 1000 | ||
| 4051 | static struct { | ||
| 4052 | int n; | ||
| 4053 | int front; | ||
| 4054 | int rear; | ||
| 4055 | synode_no q[FIFO_SIZE]; | ||
| 4056 | } delay_fifo; | ||
| 4057 | |||
| 4058 | 13322 | static inline int addone(int i) { return ((i + 1) % FIFO_SIZE); } | |
| 4059 | |||
| 4060 | /* Is queue empty? */ | ||
| 4061 | 860187 | static inline int fifo_empty() { return delay_fifo.n <= 0; } | |
| 4062 | |||
| 4063 | /* Is queue full? */ | ||
| 4064 | 6661 | static inline int fifo_full() { return delay_fifo.n >= FIFO_SIZE; } | |
| 4065 | |||
| 4066 | /* Insert in queue */ | ||
| 4067 | 6661 | static inline void fifo_insert(synode_no s) { | |
| 4068 |
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|
6661 | if (!fifo_full()) { |
| 4069 | 6661 | delay_fifo.n++; | |
| 4070 | 6661 | delay_fifo.q[delay_fifo.rear] = s; | |
| 4071 | 6661 | delay_fifo.rear = addone(delay_fifo.rear); | |
| 4072 | } | ||
| 4073 | 6661 | } | |
| 4074 | |||
| 4075 | /* Extract first from queue */ | ||
| 4076 | 6661 | static inline synode_no fifo_extract() { | |
| 4077 |
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|
6661 | if (!fifo_empty()) { |
| 4078 | 6661 | synode_no ret = delay_fifo.q[delay_fifo.front]; | |
| 4079 | 6661 | delay_fifo.front = addone(delay_fifo.front); | |
| 4080 | 6661 | delay_fifo.n--; | |
| 4081 | 6661 | return ret; | |
| 4082 | } else { | ||
| 4083 | ✗ | return null_synode; | |
| 4084 | } | ||
| 4085 | } | ||
| 4086 | |||
| 4087 | /* Return first in queue, but do not dequeue */ | ||
| 4088 | 244252 | static inline synode_no fifo_front() { | |
| 4089 |
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|
244252 | if (!fifo_empty()) { |
| 4090 | 244252 | return delay_fifo.q[delay_fifo.front]; | |
| 4091 | } else { | ||
| 4092 | ✗ | return null_synode; | |
| 4093 | } | ||
| 4094 | } | ||
| 4095 | |||
| 4096 | struct execute_context; | ||
| 4097 | typedef struct execute_context execute_context; | ||
| 4098 | |||
| 4099 | typedef void (*exec_fp)(execute_context *xc); | ||
| 4100 | |||
| 4101 | struct execute_context { | ||
| 4102 | pax_machine *p; | ||
| 4103 | int n; | ||
| 4104 | int old_n; | ||
| 4105 | double old_t; | ||
| 4106 | synode_no exit_synode; | ||
| 4107 | synode_no delivery_limit; | ||
| 4108 | exec_fp state; | ||
| 4109 | int exit_flag; /* To avoid state explosion */ | ||
| 4110 | int inform_index; | ||
| 4111 | }; | ||
| 4112 | |||
| 4113 | static void dump_exec_state(execute_context *xc [[maybe_unused]], | ||
| 4114 | long dbg [[maybe_unused]]); | ||
| 4115 | static int x_check_exit(execute_context *xc); | ||
| 4116 | static int x_check_execute_inform(execute_context *xc); | ||
| 4117 | static void x_fetch(execute_context *xc); | ||
| 4118 | static void x_execute(execute_context *xc); | ||
| 4119 | static void x_check_increment_fetch(execute_context *xc); | ||
| 4120 | static void x_check_increment_execute(execute_context *xc); | ||
| 4121 | static void x_terminate(execute_context *xc); | ||
| 4122 | |||
| 4123 | struct fp_name { | ||
| 4124 | exec_fp fp; | ||
| 4125 | char const *name; | ||
| 4126 | }; | ||
| 4127 | |||
| 4128 | #define NAME(f) \ | ||
| 4129 | { f, #f } | ||
| 4130 | |||
| 4131 | /* List of fp, name pairs */ | ||
| 4132 | static struct fp_name MY_ATTRIBUTE((unused)) oblist[] = { | ||
| 4133 | NAME(x_fetch), NAME(x_execute), NAME(x_terminate), {nullptr, nullptr}}; | ||
| 4134 | #undef NAME | ||
| 4135 | |||
| 4136 | #if TASK_DBUG_ON | ||
| 4137 | /* purecov: begin deadcode */ | ||
| 4138 | char const *get_fp_name(exec_fp fp) { | ||
| 4139 | struct fp_name *list = oblist; | ||
| 4140 | while (list->fp) { | ||
| 4141 | if (list->fp == fp) return list->name; | ||
| 4142 | list++; | ||
| 4143 | } | ||
| 4144 | return "no such fp"; | ||
| 4145 | } | ||
| 4146 | /* purecov: end */ | ||
| 4147 | #endif | ||
| 4148 | |||
| 4149 | 6661 | static void setup_exit_handling(execute_context *xc, site_def *site) { | |
| 4150 | synode_no delay_until; | ||
| 4151 |
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|
6661 | if (is_member(site)) { |
| 4152 | 4492 | delay_until = compute_delay(site->start, site->event_horizon); | |
| 4153 | } else { /* Not in this site */ | ||
| 4154 | /* See if site will be empty when we leave. If the new site | ||
| 4155 | * is empty, we should exit after having delivered the last | ||
| 4156 | * message from the old site. */ | ||
| 4157 | |||
| 4158 | /* Note limit of delivery. We should never deliver anything after the | ||
| 4159 | * start of the next site. */ | ||
| 4160 | 2169 | xc->delivery_limit = site->start; | |
| 4161 | |||
| 4162 | /* If we are not a member of the new site, we should exit | ||
| 4163 | after having seen enough messages beyond the end of the current site. | ||
| 4164 | This ensures that a majority of the next site will have agreed upon all | ||
| 4165 | messages that belong to the current site. | ||
| 4166 | */ | ||
| 4167 | 2169 | xc->exit_synode = compute_delay(site->start, site->event_horizon); | |
| 4168 |
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|
2169 | if (is_empty_site(site)) { |
| 4169 | /* If site is empty, increase start to allow nodes to terminate before | ||
| 4170 | * start. This works as if there was a non-empty group after the | ||
| 4171 | * exit_synode, effectively allowing the majority of the current group | ||
| 4172 | * to agree on all messages up to exit_synode. | ||
| 4173 | */ | ||
| 4174 | 873 | site->start = compute_delay( | |
| 4175 | compute_delay(site->start, site->event_horizon), site->event_horizon); | ||
| 4176 | } | ||
| 4177 |
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|
2169 | if (!synode_lt(xc->exit_synode, max_synode)) { |
| 4178 | /* We need messages from the next site, so set max_synode accordingly. | ||
| 4179 | */ | ||
| 4180 |
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|
2139 | set_max_synode(incr_synode(xc->exit_synode)); |
| 4181 | } | ||
| 4182 | /* Note where we switch to execute and inform removed nodes */ | ||
| 4183 | 2169 | delay_until = xc->exit_synode; | |
| 4184 | |||
| 4185 | IFDBG(D_EXEC, FN; SYCEXP(delay_until); SYCEXP(executed_msg); | ||
| 4186 | SYCEXP(max_synode)); | ||
| 4187 | IFDBG(D_EXEC, FN; SYCEXP(xc->exit_synode); SYCEXP(executed_msg); | ||
| 4188 | SYCEXP(max_synode)); | ||
| 4189 | |||
| 4190 | /* Note that we will exit */ | ||
| 4191 | 2169 | xc->exit_flag = 1; | |
| 4192 | } | ||
| 4193 | |||
| 4194 | /* Ensure that max_synode is greater than trigger for delivery | ||
| 4195 | */ | ||
| 4196 |
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|
6661 | if (synode_gt(delay_until, max_synode)) |
| 4197 |
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|
4470 | set_max_synode(incr_msgno(delay_until)); |
| 4198 | 6661 | fifo_insert(delay_until); | |
| 4199 | 6661 | (xc->inform_index)++; | |
| 4200 | |||
| 4201 | /* If I am the leader, will propose no-ops until current max_synode | ||
| 4202 | */ | ||
| 4203 | 6661 | } | |
| 4204 | |||
| 4205 | /* Called immediately after we have got a new message. | ||
| 4206 | Terminate if we have no site. | ||
| 4207 | Otherwise, handle config messages immediately. | ||
| 4208 | Afterwards, switch to check_exit_fetch. */ | ||
| 4209 | 592701 | static void x_fetch(execute_context *xc) { | |
| 4210 | /* Execute unified_boot immediately, but do not deliver site message | ||
| 4211 | * until we are ready to execute messages from the new site | ||
| 4212 | * definition. At that point we can be certain that a majority have | ||
| 4213 | * learned everything from the old site. */ | ||
| 4214 | |||
| 4215 | 592701 | app_data *app = xc->p->learner.msg->a; | |
| 4216 |
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|
599392 | if (app && is_config(app->body.c_t) && |
| 4217 |
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|
6691 | synode_gt(executed_msg, get_site_def()->boot_key)) /* Redo test */ |
| 4218 | { | ||
| 4219 | 6661 | site_def *site = nullptr; | |
| 4220 | bool_t reconfiguration_successful = | ||
| 4221 | 6661 | handle_config(app, (xc->p->learner.msg->force_delivery != 0)); | |
| 4222 |
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|
6661 | if (reconfiguration_successful) { |
| 4223 | /* If the reconfiguration failed then it does not have any | ||
| 4224 | * effect. What follows only makes sense if the reconfiguration | ||
| 4225 | * took effect. */ | ||
| 4226 |
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|
6661 | set_last_received_config(executed_msg); |
| 4227 |
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|
6661 | synode_no min_synode = min_proposer_synode(); |
| 4228 |
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|
13322 | if (synode_eq(null_synode, min_synode) || |
| 4229 |
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|
6661 | synode_lt(delivered_msg, min_synode)) |
| 4230 |
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|
1 | min_synode = get_last_delivered_msg(); |
| 4231 |
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|
6661 | garbage_collect_site_defs(min_synode); |
| 4232 |
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|
6661 | site = get_site_def_rw(); |
| 4233 |
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|
6661 | if (site == nullptr) { |
| 4234 | ✗ | xc->state = x_terminate; | |
| 4235 | ✗ | return; | |
| 4236 | } | ||
| 4237 | IFDBG(D_EXEC, FN; STRLIT("new config "); SYCEXP(site->boot_key);); | ||
| 4238 | |||
| 4239 |
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|
6661 | if (xc->exit_flag == 0) { |
| 4240 | /* We have not yet set the exit trigger */ | ||
| 4241 |
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|
6661 | setup_exit_handling(xc, site); |
| 4242 | } | ||
| 4243 | } | ||
| 4244 | } else { | ||
| 4245 | IFDBG(D_EXEC, FN; SYCEXP(executed_msg); SYCEXP(get_site_def()->boot_key)); | ||
| 4246 | } | ||
| 4247 | /* Check for exit and increment executed_msg */ | ||
| 4248 | 592701 | x_check_increment_fetch(xc); | |
| 4249 | } | ||
| 4250 | |||
| 4251 | /* Push messages to nodes that have been removed. | ||
| 4252 | Signal switch to execute when nothing left to push by returning 1 */ | ||
| 4253 | 595952 | static int x_check_execute_inform(execute_context *xc) { | |
| 4254 | IFDBG(D_EXEC, FN; SYCEXP(fifo_front()); SYCEXP(executed_msg); | ||
| 4255 | SYCEXP(xc->exit_synode); NDBG(xc->exit_flag, d)); | ||
| 4256 |
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|
595952 | if (fifo_empty()) { |
| 4257 | 358423 | return 1; | |
| 4258 |
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|
237529 | } else if (!synode_lt(executed_msg, fifo_front())) { |
| 4259 | 6661 | while ( | |
| 4260 |
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|
20045 | !fifo_empty() && |
| 4261 |
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|
6723 | !synode_lt(executed_msg, fifo_front())) { /* More than one may match */ |
| 4262 | 6661 | inform_removed(xc->inform_index, 0); | |
| 4263 | 6661 | fifo_extract(); | |
| 4264 | 6661 | (xc->inform_index)--; | |
| 4265 | } | ||
| 4266 | 6661 | garbage_collect_servers(); | |
| 4267 | 6661 | return 1; | |
| 4268 | } | ||
| 4269 | 230868 | dump_exec_state(xc, D_EXEC); | |
| 4270 | 230868 | return 0; | |
| 4271 | } | ||
| 4272 | |||
| 4273 | /* Check for exit and return 1 if we should exit. */ | ||
| 4274 | 1167415 | static int x_check_exit(execute_context *xc) { | |
| 4275 | /* See if we should exit when having seen this message */ | ||
| 4276 |
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|
1212307 | return (xc->exit_flag && !synode_lt(executed_msg, xc->exit_synode) && |
| 4277 |
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|
1212307 | !synode_lt(delivered_msg, xc->delivery_limit)); |
| 4278 | } | ||
| 4279 | |||
| 4280 | /* Terminate if we should exit, else increment executed_msg and see if we | ||
| 4281 | * should switch to execute */ | ||
| 4282 | 595952 | static void x_check_increment_fetch(execute_context *xc) { | |
| 4283 |
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|
595952 | if (x_check_exit(xc)) { |
| 4284 | ✗ | xc->state = x_terminate; | |
| 4285 | } else { | ||
| 4286 | 595952 | SET_EXECUTED_MSG(incr_synode(executed_msg)); | |
| 4287 |
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|
595952 | if (x_check_execute_inform(xc)) { |
| 4288 | 365084 | xc->state = x_execute; | |
| 4289 | } | ||
| 4290 | } | ||
| 4291 | 595952 | } | |
| 4292 | |||
| 4293 | /* Terminate if we should exit, else increment delivered_msg and see if we | ||
| 4294 | * should switch to fetch */ | ||
| 4295 | 571463 | static void x_check_increment_execute(execute_context *xc) { | |
| 4296 |
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|
571463 | if (x_check_exit(xc)) { |
| 4297 | 2169 | xc->state = x_terminate; | |
| 4298 | } else { | ||
| 4299 | /* Increment delivered_msg and switch to fetch if delivered_msg equals | ||
| 4300 | * executed_msg; */ | ||
| 4301 | 569294 | delivered_msg = incr_synode(delivered_msg); | |
| 4302 |
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|
569294 | if (synode_eq(delivered_msg, executed_msg)) { |
| 4303 | 362915 | xc->state = x_fetch; | |
| 4304 | } | ||
| 4305 | } | ||
| 4306 | 571463 | } | |
| 4307 | |||
| 4308 | /* Deliver one message if it should be delivered. Switch state to see if | ||
| 4309 | we should exit */ | ||
| 4310 | 571463 | static void x_execute(execute_context *xc) { | |
| 4311 | 571463 | site_def *x_site = find_site_def_rw(delivered_msg); | |
| 4312 | |||
| 4313 | IFDBG(D_EXEC, FN; SYCEXP(delivered_msg); SYCEXP(delivered_msg); | ||
| 4314 | SYCEXP(executed_msg); SYCEXP(xc->exit_synode); NDBG(xc->exit_flag, d)); | ||
| 4315 | 571463 | if (!is_cached(delivered_msg)) { | |
| 4316 | /* purecov: begin deadcode */ | ||
| 4317 | #ifdef TASK_EVENT_TRACE | ||
| 4318 | dump_task_events(); | ||
| 4319 | #endif | ||
| 4320 | /* purecov: end */ | ||
| 4321 | } | ||
| 4322 |
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|
571463 | if (!ignore_message(delivered_msg, x_site, "x_execute")) { |
| 4323 |
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|
568232 | assert(is_cached(delivered_msg) && "delivered_msg should have been cached"); |
| 4324 | 568232 | xc->p = get_cache(delivered_msg); | |
| 4325 |
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✓ Branch 1 taken 354841 times.
|
568232 | if ((xc->p)->learner.msg->msg_type != no_op) { |
| 4326 | /* Avoid delivery after start if we should exit */ | ||
| 4327 |
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|
213391 | if (xc->exit_flag == 0 || synode_lt(delivered_msg, xc->delivery_limit)) { |
| 4328 | IFDBG(D_EXEC, FN; STRLIT("executing "); SYCEXP(delivered_msg); | ||
| 4329 | SYCEXP(executed_msg); SYCEXP(xc->delivery_limit); | ||
| 4330 | NDBG(xc->exit_flag, d)); | ||
| 4331 | 213388 | last_delivered_msg = delivered_msg; | |
| 4332 | 213388 | execute_msg(find_site_def_rw(delivered_msg), xc->p, xc->p->learner.msg); | |
| 4333 | } | ||
| 4334 | } | ||
| 4335 | } | ||
| 4336 | /* Garbage collect old servers */ | ||
| 4337 |
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|
571463 | if (synode_eq(delivered_msg, x_site->start)) { |
| 4338 | 7190 | garbage_collect_servers(); | |
| 4339 | } | ||
| 4340 | #if defined(TASK_DBUG_ON) && TASK_DBUG_ON | ||
| 4341 | IFDBG(D_EXEC, perf_dbg(&xc->n, &xc->old_n, &xc->old_t)); | ||
| 4342 | #endif | ||
| 4343 | /* Check for exit and increment delivered_msg */ | ||
| 4344 | 571463 | x_check_increment_execute(xc); | |
| 4345 | 571463 | } | |
| 4346 | |||
| 4347 | static execute_context *debug_xc; | ||
| 4348 | |||
| 4349 | 1348899 | static void dump_exec_state(execute_context *xc [[maybe_unused]], | |
| 4350 | long dbg [[maybe_unused]]) { | ||
| 4351 | IFDBG(dbg, FN; SYCEXP(executed_msg); SYCEXP(delivered_msg); | ||
| 4352 | SYCEXP(max_synode); SYCEXP(last_delivered_msg); NDBG(delay_fifo.n, d); | ||
| 4353 | NDBG(delay_fifo.front, d); NDBG(delay_fifo.rear, d); | ||
| 4354 | SYCEXP(fifo_front()); SYCEXP(xc->exit_synode); | ||
| 4355 | SYCEXP(xc->delivery_limit); NDBG(xc->exit_flag, d); | ||
| 4356 | NDBG(xc->inform_index, d); NDBG(prop_started, d); | ||
| 4357 | NDBG(prop_finished, d);); | ||
| 4358 | 1348899 | } | |
| 4359 | |||
| 4360 | 1111503 | static void dump_debug_exec_state() { | |
| 4361 |
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|
1111503 | if (debug_xc) dump_exec_state(debug_xc, D_EXEC); |
| 4362 | 1111503 | } | |
| 4363 | |||
| 4364 | /* Terminate the excutor_task. */ | ||
| 4365 | 2169 | static void x_terminate(execute_context *xc) { | |
| 4366 | 2169 | dump_exec_state(xc, D_BUG); | |
| 4367 | 2169 | xc->state = nullptr; | |
| 4368 | 2169 | } | |
| 4369 | |||
| 4370 | 520971 | static int executor_task(task_arg arg [[maybe_unused]]) { | |
| 4371 | DECL_ENV | ||
| 4372 | execute_context xc; | ||
| 4373 | 2197 | ENV_INIT | |
| 4374 | 2197 | END_ENV_INIT | |
| 4375 | END_ENV; | ||
| 4376 | /* xcom_debug_mask = D_BUG; */ | ||
| 4377 | IFDBG(D_EXEC, FN; NDBG(stack->sp->state, d); SYCEXP(executed_msg);); | ||
| 4378 |
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|
520971 | TASK_BEGIN |
| 4379 | 2197 | ep->xc.p = nullptr; | |
| 4380 | 2197 | ep->xc.n = 0; | |
| 4381 | 2197 | ep->xc.old_n = 0; | |
| 4382 | 2197 | ep->xc.old_t = task_now(); | |
| 4383 | 2197 | ep->xc.exit_synode = null_synode; | |
| 4384 | 2197 | ep->xc.delivery_limit = null_synode; | |
| 4385 | 2197 | ep->xc.exit_flag = 0; | |
| 4386 | 2197 | ep->xc.inform_index = -1; | |
| 4387 | 2197 | delay_fifo.n = 0; | |
| 4388 | 2197 | delay_fifo.front = 0; | |
| 4389 | 2197 | delay_fifo.rear = 0; | |
| 4390 | 2197 | debug_xc = &ep->xc; | |
| 4391 | |||
| 4392 |
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|
2197 | if (executed_msg.msgno == 0) executed_msg.msgno = 1; |
| 4393 | 2197 | delivered_msg = executed_msg; | |
| 4394 | 2197 | ep->xc.state = x_fetch; | |
| 4395 | 2197 | executor_site = find_site_def_rw(executed_msg); | |
| 4396 | |||
| 4397 | /* The following loop implements a state machine based on function pointers, | ||
| 4398 | effectively acting as non-local gotos. | ||
| 4399 | The functions all operate on data in the execution context xc, and | ||
| 4400 | switch state by setting xc->state to the function corresponding to the | ||
| 4401 | new state. | ||
| 4402 | */ | ||
| 4403 |
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|
1171781 | while (!xcom_shutdown && ep->xc.state != nullptr) { |
| 4404 | IFDBG(D_EXEC, FN; STRLIT(get_fp_name(ep->xc.state));); | ||
| 4405 |
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1169612 | if (ep->xc.state == x_fetch) { /* Special case because of task macros */ |
| 4406 |
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|
595980 | if (ignore_message(executed_msg, executor_site, "executor_task")) { |
| 4407 | IFDBG(D_EXEC, FN; STRLIT("ignoring message "); SYCEXP(executed_msg)); | ||
| 4408 | 3251 | x_check_increment_fetch(&ep->xc); /* Just increment past losers */ | |
| 4409 | } else { | ||
| 4410 | IFDBG(D_EXEC, FN; STRLIT("fetching message "); SYCEXP(executed_msg)); | ||
| 4411 |
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|
1625939 | TASK_CALL(get_xcom_message(&ep->xc.p, executed_msg, FIND_MAX)); |
| 4412 | IFDBG(D_EXEC, FN; STRLIT("got message "); SYCEXP(ep->xc.p->synode); | ||
| 4413 | COPY_AND_FREE_GOUT(dbg_app_data(ep->xc.p->learner.msg->a))); | ||
| 4414 | 592701 | x_fetch(&ep->xc); | |
| 4415 | } | ||
| 4416 | } else { | ||
| 4417 | 573632 | ep->xc.state(&ep->xc); | |
| 4418 | } | ||
| 4419 | } | ||
| 4420 | |||
| 4421 | /* Inform all removed nodes before we exit */ | ||
| 4422 | ADD_DBG(D_FSM, add_event(EVENT_DUMP_PAD, string_arg("terminating"));) | ||
| 4423 | 2169 | inform_removed(ep->xc.inform_index, 1); | |
| 4424 | 2169 | dump_exec_state(&ep->xc, D_EXEC); | |
| 4425 | |||
| 4426 | #ifndef NO_DELAYED_TERMINATION | ||
| 4427 | IFDBG(D_EXEC, FN; STRLIT("delayed terminate and exit")); | ||
| 4428 | |||
| 4429 | /* Wait to allow messages to propagate */ | ||
| 4430 |
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|
4338 | TASK_DELAY(TERMINATE_DELAY); |
| 4431 | |||
| 4432 | /* Start termination of xcom */ | ||
| 4433 | 2169 | terminate_and_exit(); | |
| 4434 | #endif | ||
| 4435 | |||
| 4436 | 2190 | FINALLY | |
| 4437 | 2190 | dump_exec_state(&ep->xc, D_EXEC); | |
| 4438 | IFDBG(D_BUG, FN; STRLIT(" shutdown "); SYCEXP(executed_msg); | ||
| 4439 | NDBG(task_now(), f)); | ||
| 4440 |
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|
2190 | TASK_END; |
| 4441 | } | ||
| 4442 | |||
| 4443 | 9325 | static synode_no get_sweep_start() { | |
| 4444 | 9325 | synode_no find = executed_msg; | |
| 4445 | 9325 | find.node = get_nodeno(find_site_def(find)); | |
| 4446 |
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|
9325 | if (find.node < executed_msg.node) { |
| 4447 | ✗ | find = incr_msgno(find); | |
| 4448 | } | ||
| 4449 | 9325 | return find; | |
| 4450 | } | ||
| 4451 | |||
| 4452 | /* Allow takeover of channel if not all are leaders. We may need to adjust | ||
| 4453 | * this if we allow any subset of the nodes as leaders */ | ||
| 4454 | 159259 | static bool allow_channel_takeover(site_def const *site) { | |
| 4455 | 159259 | return site->max_active_leaders != active_leaders_all; | |
| 4456 | } | ||
| 4457 | |||
| 4458 | 159259 | static void broadcast_noop(synode_no find, pax_machine *p) { | |
| 4459 | 159259 | site_def const *site = find_site_def(find); | |
| 4460 | |||
| 4461 | /* | ||
| 4462 | If we allow channel hijacking, we cannot send skip_op, but need consensus. | ||
| 4463 | There are two options here: | ||
| 4464 | |||
| 4465 | a) We unconditionally propose a `no_op` using the regular 3-phase Paxos | ||
| 4466 | protocol, or | ||
| 4467 | b) We propose a `no_op` using the 2-phase Paxos protocol *if* we | ||
| 4468 | are sure that no other Proposer will try to run the 2-phase Paxos | ||
| 4469 | protocol on `find`. If we are not sure, we propose using the 3-phase Paxos | ||
| 4470 | protocol. | ||
| 4471 | |||
| 4472 | Option (a) is always safe, but we pay the cost of 3-phase Paxos. | ||
| 4473 | Option (b) can be implemented by having the leaders keep track of the | ||
| 4474 | synods they allocate to non-leaders. If we are the leader for `find` and we | ||
| 4475 | allocated it to a non-leader, we must use 3-phase Paxos here to be safe | ||
| 4476 | against the non-leader using 2-phase Paxos. If we never allocated `find` to | ||
| 4477 | a non-leader, we can use 2-phase Paxos here if we ensure we don't allocate | ||
| 4478 | `find` to a non-leader afterwards. | ||
| 4479 | |||
| 4480 | We go with option (a) because there is no evidence that the additional | ||
| 4481 | complexity that option (b) requires is worthwhile. | ||
| 4482 | */ | ||
| 4483 |
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|
159259 | if (allow_channel_takeover(site)) { |
| 4484 | ✗ | propose_noop(find, p); // Single leader | |
| 4485 | } else { | ||
| 4486 | 159259 | skip_msg(pax_msg_new(find, site)); // Multiple leaders | |
| 4487 | } | ||
| 4488 | 159259 | } | |
| 4489 | |||
| 4490 | 843579 | static int sweeper_task(task_arg arg [[maybe_unused]]) { | |
| 4491 | DECL_ENV | ||
| 4492 | synode_no find; | ||
| 4493 | 2197 | ENV_INIT | |
| 4494 | 2197 | END_ENV_INIT | |
| 4495 | END_ENV; | ||
| 4496 | |||
| 4497 |
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|
843579 | TASK_BEGIN |
| 4498 | |||
| 4499 | 2197 | ep->find = get_sweep_start(); | |
| 4500 | |||
| 4501 |
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841389 | while (!xcom_shutdown) { |
| 4502 | 841389 | ep->find.group_id = | |
| 4503 | 841389 | executed_msg.group_id; /* In case group id has changed */ | |
| 4504 | #ifndef AGGRESSIVE_SWEEP | ||
| 4505 | while (!is_only_task()) { | ||
| 4506 | TASK_YIELD; | ||
| 4507 | } | ||
| 4508 | #endif | ||
| 4509 | ADD_DBG(D_NONE, add_event(EVENT_DUMP_PAD, string_arg("sweeper ready")); | ||
| 4510 | add_synode_event(executed_msg);); | ||
| 4511 | /* IFDBG(D_NONE, FN; STRLIT("ready to run "); */ | ||
| 4512 | /* SYCEXP(executed_msg); SYCEXP(max_synode); | ||
| 4513 | * SYCEXP(ep->find)); | ||
| 4514 | */ | ||
| 4515 |
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|
1111126 | while (synode_lt(ep->find, max_synode) && !too_far(ep->find)) { |
| 4516 | /* pax_machine * pm = hash_get(ep->find); */ | ||
| 4517 | 457896 | pax_machine *pm = nullptr; | |
| 4518 | ADD_DBG(D_NONE, | ||
| 4519 | add_event(EVENT_DUMP_PAD, string_arg("sweeper examining")); | ||
| 4520 | add_synode_event(ep->find);); | ||
| 4521 |
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457896 | if (ep->find.node == VOID_NODE_NO) { |
| 4522 |
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|
188159 | if (synode_gt(executed_msg, ep->find)) { |
| 4523 | 7128 | ep->find = get_sweep_start(); | |
| 4524 | } | ||
| 4525 |
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188159 | if (ep->find.node == VOID_NODE_NO) goto deactivate; |
| 4526 | } | ||
| 4527 | 269737 | pm = get_cache(ep->find); | |
| 4528 | ADD_DBG(D_CONS, add_event(EVENT_DUMP_PAD, string_arg("sweeper checking")); | ||
| 4529 | add_synode_event(ep->find); | ||
| 4530 | add_event(EVENT_DUMP_PAD, string_arg(pax_op_to_str(pm->op))); | ||
| 4531 | add_event(EVENT_DUMP_PAD, string_arg("pm")); | ||
| 4532 | add_event(EVENT_DUMP_PAD, void_arg(pm));); | ||
| 4533 |
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|
269737 | if (pm && !pm->force_delivery) { /* We want full 3 phase Paxos for |
| 4534 | forced messages */ | ||
| 4535 | ADD_DBG( | ||
| 4536 | D_CONS, add_event(EVENT_DUMP_PAD, string_arg("sweeper checking")); | ||
| 4537 | add_synode_event(ep->find); | ||
| 4538 | add_event(EVENT_DUMP_PAD, string_arg(pax_op_to_str(pm->op))); | ||
| 4539 | add_event(EVENT_DUMP_PAD, string_arg("is_busy_machine")); | ||
| 4540 | add_event(EVENT_DUMP_PAD, int_arg(is_busy_machine(pm))); | ||
| 4541 | add_event(EVENT_DUMP_PAD, string_arg("pm->acceptor.promise.cnt")); | ||
| 4542 | add_event(EVENT_DUMP_PAD, int_arg(pm->acceptor.promise.cnt)); | ||
| 4543 | add_event(EVENT_DUMP_PAD, string_arg("finished(pm)")); | ||
| 4544 | add_event(EVENT_DUMP_PAD, int_arg(finished(pm))); | ||
| 4545 | add_event(EVENT_DUMP_PAD, string_arg("pm->acceptor.msg")); | ||
| 4546 | add_event(EVENT_DUMP_PAD, void_arg(pm->acceptor.msg));); | ||
| 4547 | /* IFDBG(D_NONE, FN; dbg_pax_machine(pm)); */ | ||
| 4548 |
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535531 | if (!is_busy_machine(pm) && pm->acceptor.promise.cnt == 0 && |
| 4549 |
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|
535531 | !pm->acceptor.msg && !finished(pm)) { |
| 4550 | ADD_DBG( | ||
| 4551 | D_CONS, add_event(EVENT_DUMP_PAD, string_arg("sweeper skipping")); | ||
| 4552 | add_synode_event(ep->find); | ||
| 4553 | add_event(EVENT_DUMP_PAD, string_arg(pax_op_to_str(pm->op)));); | ||
| 4554 | 160244 | site_def *config = find_site_def_rw(ep->find); | |
| 4555 | // Do not send noop if single writer, since there normally will be | ||
| 4556 | // no holes in the message sequence, and it may interfere with | ||
| 4557 | // messages delegated to secondary nodes. | ||
| 4558 |
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|
319503 | if (config->max_active_leaders != 1 && |
| 4559 |
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159259 | !ignore_message(ep->find, config, "sweeper_task")) { |
| 4560 | 159259 | broadcast_noop(ep->find, pm); | |
| 4561 | } | ||
| 4562 | IFDBG(D_NONE, FN; STRLIT("skipping "); SYCEXP(ep->find)); | ||
| 4563 | } | ||
| 4564 | } | ||
| 4565 | 269737 | ep->find = incr_msgno(ep->find); | |
| 4566 | } | ||
| 4567 | 653230 | deactivate: | |
| 4568 |
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|
841389 | if (!synode_lt(ep->find, max_synode)) { |
| 4569 |
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855179 | TASK_DEACTIVATE; |
| 4570 | } else { | ||
| 4571 |
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|
827592 | TASK_DELAY(0.010); /* Let poll_wait check for IO */ |
| 4572 | } | ||
| 4573 | } | ||
| 4574 | ✗ | FINALLY | |
| 4575 | IFDBG(D_BUG, FN; STRLIT(" shutdown sweeper "); SYCEXP(executed_msg); | ||
| 4576 | NDBG(task_now(), f)); | ||
| 4577 |
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|
2190 | TASK_END; |
| 4578 | } | ||
| 4579 | |||
| 4580 | 632707 | static double wakeup_delay(double old) { | |
| 4581 | 632707 | double const minimum_threshold = 0.1; | |
| 4582 | #ifdef EXECUTOR_TASK_AGGRESSIVE_NO_OP | ||
| 4583 | double const maximum_threshold = 1.0; | ||
| 4584 | #else | ||
| 4585 | 632707 | double const maximum_threshold = 20.0; | |
| 4586 | #endif /* EXECUTOR_TASK_AGGRESSIVE_NO_OP */ | ||
| 4587 | 632707 | double retval = 0.0; | |
| 4588 |
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|
632707 | if (0.0 == old) { |
| 4589 | 349964 | double m = median_time(); | |
| 4590 | 349964 | double const fuzz = 5.0; | |
| 4591 | IFDBG(D_BUG, FN; NDBG(m, f)); | ||
| 4592 | // Guard against unreasonable estimates of median consensus time | ||
| 4593 |
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349964 | if (m <= 0.0) m = minimum_threshold; |
| 4594 |
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349964 | if (m > maximum_threshold / fuzz) m = (maximum_threshold / fuzz) / 2.0; |
| 4595 | 349964 | retval = minimum_threshold + fuzz * m + m * xcom_drand48(); | |
| 4596 | } else { | ||
| 4597 | 282743 | retval = old * 1.4142136; /* Exponential backoff */ | |
| 4598 | } | ||
| 4599 | /* If we exceed maximum, choose a random value in the max/2..max interval */ | ||
| 4600 |
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632707 | if (retval > maximum_threshold) { |
| 4601 | 258 | double const low = maximum_threshold / 2.0; | |
| 4602 | 258 | retval = low + xcom_drand48() * (maximum_threshold - low); | |
| 4603 | } | ||
| 4604 | IFDBG(D_BUG, FN; NDBG(retval, f)); | ||
| 4605 | 632707 | return retval; | |
| 4606 | } | ||
| 4607 | |||
| 4608 | 21774 | static site_def const *init_noop(synode_no find, pax_machine *p) { | |
| 4609 | /* Prepare to send a noop */ | ||
| 4610 | 21774 | site_def const *site = find_site_def(find); | |
| 4611 | IFDBG(D_NONE, FN; SYCEXP(find); SYCEXP(executed_msg)); | ||
| 4612 |
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|
21774 | assert(!too_far(find)); |
| 4613 | 21774 | replace_pax_msg(&p->proposer.msg, pax_msg_new(find, site)); | |
| 4614 |
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|
21774 | assert(p->proposer.msg); |
| 4615 | 21774 | create_noop(p->proposer.msg); | |
| 4616 | 21774 | return site; | |
| 4617 | } | ||
| 4618 | |||
| 4619 | 21774 | static void propose_noop(synode_no find, pax_machine *p) { | |
| 4620 | 21774 | site_def const *site = init_noop(find, p); | |
| 4621 | 21774 | pax_msg *clone = clone_pax_msg(p->proposer.msg); | |
| 4622 |
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|
21774 | if (clone != nullptr) { |
| 4623 | IFDBG(D_CONS, FN; SYCEXP(find)); | ||
| 4624 | 21774 | push_msg_3p(site, p, clone, find, no_op); | |
| 4625 | } else { | ||
| 4626 | /* purecov: begin inspected */ | ||
| 4627 | ✗ | G_DEBUG("Unable to propose NoOp due to an OOM error."); | |
| 4628 | /* purecov: end */ | ||
| 4629 | } | ||
| 4630 | 21774 | } | |
| 4631 | |||
| 4632 | #if 0 | ||
| 4633 | static void propose_noop_2p(synode_no find, pax_machine *p) { | ||
| 4634 | site_def const *site = init_noop(find, p); | ||
| 4635 | IFDBG(D_CONS, FN; SYCEXP(find)); | ||
| 4636 | push_msg_2p(site, p); | ||
| 4637 | } | ||
| 4638 | #endif | ||
| 4639 | |||
| 4640 | 426200 | static void send_read(synode_no find) { | |
| 4641 | /* Prepare to send a read_op */ | ||
| 4642 | 426200 | site_def const *site = find_site_def(find); | |
| 4643 | |||
| 4644 | IFDBG(D_NONE, FN; NDBG(get_maxnodes(site), u); NDBG(get_nodeno(site), u);); | ||
| 4645 | ADD_DBG(D_CONS, add_event(EVENT_DUMP_PAD, string_arg("find")); | ||
| 4646 | add_synode_event(find); add_event(EVENT_DUMP_PAD, string_arg("site")); | ||
| 4647 | add_event(EVENT_DUMP_PAD, void_arg((void *)find_site_def_rw(find))); | ||
| 4648 | add_event(EVENT_DUMP_PAD, string_arg("get_nodeno(site)")); | ||
| 4649 | add_event(EVENT_DUMP_PAD, uint_arg(get_nodeno(site)));); | ||
| 4650 | |||
| 4651 | /* See if node number matches ours */ | ||
| 4652 |
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|
426200 | if (site) { |
| 4653 |
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|
425940 | if (find.node != get_nodeno(site)) { |
| 4654 |
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|
268774 | pax_msg *pm = pax_msg_new(find, site); |
| 4655 |
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|
268774 | ref_msg(pm); |
| 4656 |
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|
268774 | create_read(site, pm); |
| 4657 | IFDBG(D_NONE, FN; SYCEXP(find);); | ||
| 4658 | |||
| 4659 | IFDBG(D_NONE, FN; NDBG(get_maxnodes(site), u); NDBG(get_nodeno(site), u); | ||
| 4660 | PTREXP(pm)); | ||
| 4661 | /* send_server_msg(site, find.node, pm); */ | ||
| 4662 | #if 0 | ||
| 4663 | send_to_others(site, pm, "send_read"); | ||
| 4664 | #else | ||
| 4665 | /* If we have no node number, ask all the others */ | ||
| 4666 |
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|
268774 | if (get_nodeno(site) == VOID_NODE_NO) |
| 4667 |
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|
84425 | send_to_others(site, pm, "send_read"); |
| 4668 | else | ||
| 4669 | /* Ask a random node */ | ||
| 4670 |
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|
184349 | send_to_someone(site, pm, "send_read"); |
| 4671 | #endif | ||
| 4672 |
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|
268774 | unref_msg(&pm); |
| 4673 | } else { /* If node number matches our own number, ask all the others */ | ||
| 4674 |
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157166 | pax_msg *pm = pax_msg_new(find, site); |
| 4675 |
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157166 | ref_msg(pm); |
| 4676 |
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157166 | create_read(site, pm); |
| 4677 |
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157166 | send_to_others(site, pm, "send_read"); |
| 4678 |
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|
157166 | unref_msg(&pm); |
| 4679 | } | ||
| 4680 | } | ||
| 4681 | 426200 | } | |
| 4682 | |||
| 4683 | /* Find missing values */ | ||
| 4684 | |||
| 4685 | 67919 | static int ok_to_propose(pax_machine *p) { | |
| 4686 |
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|
90808 | int retval = (is_forcing_node(p) || !recently_active(p)) && !finished(p) && |
| 4687 |
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|
22889 | !is_busy_machine(p); |
| 4688 | IFDBG(D_NONE, FN; NDBG(p->synode.node, u); NDBG(recently_active(p), d); | ||
| 4689 | NDBG(finished(p), d); NDBG(is_busy_machine(p), d); NDBG(retval, d)); | ||
| 4690 | 67919 | return retval; | |
| 4691 | } | ||
| 4692 | |||
| 4693 | 387557 | static void read_missing_values(int n) { | |
| 4694 | 387557 | synode_no find = executed_msg; | |
| 4695 | 387557 | synode_no end = max_synode; | |
| 4696 | 387557 | int i = 0; | |
| 4697 | |||
| 4698 | IFDBG(D_NONE, FN; SYCEXP(find); SYCEXP(end)); | ||
| 4699 |
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441674 | if (synode_gt(executed_msg, max_synode) || |
| 4700 |
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54117 | synode_eq(executed_msg, null_synode)) |
| 4701 | 333440 | return; | |
| 4702 | |||
| 4703 |
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|
680731 | while (!synode_gt(find, end) && i < n && !too_far(find)) { |
| 4704 |
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626614 | pax_machine *p = force_get_cache(find); |
| 4705 | ADD_DBG(D_NONE, add_synode_event(find); add_synode_event(end); | ||
| 4706 | add_event(EVENT_DUMP_PAD, string_arg("active ")); | ||
| 4707 | add_event(EVENT_DUMP_PAD, int_arg(recently_active(p))); | ||
| 4708 | add_event(EVENT_DUMP_PAD, string_arg("finished ")); | ||
| 4709 | add_event(EVENT_DUMP_PAD, int_arg(finished(p))); | ||
| 4710 | add_event(EVENT_DUMP_PAD, string_arg("busy ")); | ||
| 4711 | add_event(EVENT_DUMP_PAD, int_arg(is_busy_machine(p)));); | ||
| 4712 | IFDBG(D_NONE, FN; SYCEXP(find); SYCEXP(end); NDBG(recently_active(p), d); | ||
| 4713 | NDBG(finished(p), d); NDBG(is_busy_machine(p), d)); | ||
| 4714 |
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|
626614 | if (!recently_active(p) && !finished(p) && !is_busy_machine(p)) { |
| 4715 |
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425932 | send_read(find); |
| 4716 | } | ||
| 4717 |
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626614 | find = incr_synode(find); |
| 4718 | 626614 | i++; | |
| 4719 | } | ||
| 4720 | } | ||
| 4721 | |||
| 4722 | 129055 | static void propose_missing_values(int n) { | |
| 4723 | 129055 | synode_no find = executed_msg; | |
| 4724 | 129055 | synode_no end = max_synode; | |
| 4725 | 129055 | int i = 0; | |
| 4726 | |||
| 4727 | IFDBG(D_NONE, FN; NDBG(get_maxnodes(get_site_def()), u); SYCEXP(find); | ||
| 4728 | SYCEXP(end)); | ||
| 4729 |
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135700 | if (synode_gt(executed_msg, max_synode) || |
| 4730 |
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|
6645 | synode_eq(executed_msg, null_synode)) |
| 4731 | 122410 | return; | |
| 4732 | |||
| 4733 | IFDBG(D_NONE, FN; SYCEXP(find); SYCEXP(end)); | ||
| 4734 | 6645 | i = 0; | |
| 4735 |
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74926 | while (!synode_gt(find, end) && i < n && !too_far(find)) { |
| 4736 |
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68283 | pax_machine *p = force_get_cache(find); |
| 4737 |
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|
68283 | if (wait_forced_config) { |
| 4738 | 3546 | force_pax_machine(p, 1); | |
| 4739 | } | ||
| 4740 | IFDBG(D_NONE, FN; NDBG(ok_to_propose(p), d); TIMECEXP(task_now()); | ||
| 4741 | TIMECEXP(p->last_modified); SYCEXP(find)); | ||
| 4742 |
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68283 | site_def *site = find_site_def_rw(find); |
| 4743 |
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68283 | if (get_nodeno(site) == VOID_NODE_NO) break; |
| 4744 |
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|
136200 | if (!ignore_message(find, site, "propose_missing_values") && |
| 4745 |
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67919 | ok_to_propose(p)) { |
| 4746 |
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21774 | propose_noop(find, p); |
| 4747 | } | ||
| 4748 |
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68281 | find = incr_synode(find); |
| 4749 | 68281 | i++; | |
| 4750 | } | ||
| 4751 | } | ||
| 4752 | |||
| 4753 | /* Message handlers */ | ||
| 4754 | |||
| 4755 | /* | ||
| 4756 | Reply to the sender of a message. | ||
| 4757 | Avoid using the outbound TCP connection to the node that sent the message, since | ||
| 4758 | it is simpler and safer to always use the same TCP connection as the one the | ||
| 4759 | message arrived on. We then know that the answer will always go to the same | ||
| 4760 | client (and the same instance of that client) that sent the request. | ||
| 4761 | */ | ||
| 4762 | #define reply_msg(m) \ | ||
| 4763 | { \ | ||
| 4764 | if (is_local_node((m)->from, site)) { \ | ||
| 4765 | dispatch_op(site, m, NULL); \ | ||
| 4766 | } else { \ | ||
| 4767 | link_into(&(msg_link_new((m), (m)->from)->l), reply_queue); \ | ||
| 4768 | } \ | ||
| 4769 | } | ||
| 4770 | |||
| 4771 | #define CREATE_REPLY(x) \ | ||
| 4772 | pax_msg *reply = NULL; \ | ||
| 4773 | CLONE_PAX_MSG(reply, x) | ||
| 4774 | |||
| 4775 | #define SEND_REPLY \ | ||
| 4776 | reply_msg(reply); \ | ||
| 4777 | replace_pax_msg(&reply, NULL) | ||
| 4778 | |||
| 4779 | 329091 | bool_t safe_app_data_copy(pax_msg **target, app_data_ptr source) { | |
| 4780 | 329091 | copy_app_data(&(*target)->a, source); | |
| 4781 |
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329091 | if ((*target)->a == nullptr && source != nullptr) { |
| 4782 | ✗ | oom_abort = 1; | |
| 4783 | ✗ | replace_pax_msg(target, nullptr); | |
| 4784 | ✗ | return FALSE; | |
| 4785 | } | ||
| 4786 | 329091 | return TRUE; | |
| 4787 | } | ||
| 4788 | |||
| 4789 | 118783 | static pax_msg *create_learn_msg_for_ignorant_node(pax_machine *p, pax_msg *pm, | |
| 4790 | synode_no synode) { | ||
| 4791 |
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118783 | CREATE_REPLY(pm); |
| 4792 | IFDBG(D_NONE, FN; SYCEXP(synode)); | ||
| 4793 | 118783 | reply->synode = synode; | |
| 4794 | 118783 | reply->proposal = p->learner.msg->proposal; | |
| 4795 | 118783 | reply->msg_type = p->learner.msg->msg_type; | |
| 4796 |
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118783 | safe_app_data_copy(&reply, p->learner.msg->a); |
| 4797 |
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118783 | if (reply != nullptr) set_learn_type(reply); |
| 4798 | /* set_unique_id(reply, p->learner.msg->unique_id); */ | ||
| 4799 | 118783 | return reply; | |
| 4800 | } | ||
| 4801 | |||
| 4802 | 111280 | static void teach_ignorant_node(site_def const *site, pax_machine *p, | |
| 4803 | pax_msg *pm, synode_no synode, | ||
| 4804 | linkage *reply_queue) { | ||
| 4805 |
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111280 | pax_msg *reply = create_learn_msg_for_ignorant_node(p, pm, synode); |
| 4806 |
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111280 | if (reply != nullptr) SEND_REPLY; |
| 4807 | 111280 | } | |
| 4808 | |||
| 4809 | /* Handle incoming read */ | ||
| 4810 | 333399 | static void handle_read(site_def const *site, pax_machine *p, | |
| 4811 | linkage *reply_queue, pax_msg *pm) { | ||
| 4812 | IFDBG(D_NONE, FN; BALCEXP(pm->proposal); BALCEXP(p->acceptor.promise); | ||
| 4813 | if (p->acceptor.msg) BALCEXP(p->acceptor.msg->proposal); | ||
| 4814 | STRLIT("type "); STRLIT(pax_msg_type_to_str(pm->msg_type))); | ||
| 4815 | |||
| 4816 |
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333399 | if (finished(p)) { /* We have learned a value */ |
| 4817 | 111280 | teach_ignorant_node(site, p, pm, pm->synode, reply_queue); | |
| 4818 | } | ||
| 4819 | 333399 | } | |
| 4820 | |||
| 4821 | 36334 | static pax_msg *create_ack_prepare_msg(pax_machine *p, pax_msg *pm, | |
| 4822 | synode_no synode) { | ||
| 4823 |
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36334 | CREATE_REPLY(pm); |
| 4824 | 36334 | reply->synode = synode; | |
| 4825 |
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|
36334 | if (accepted(p)) { /* We have accepted a value */ |
| 4826 | 3969 | reply->proposal = p->acceptor.msg->proposal; | |
| 4827 | 3969 | reply->msg_type = p->acceptor.msg->msg_type; | |
| 4828 | IFDBG(D_NONE, FN; STRLIT(" already accepted value "); SYCEXP(synode)); | ||
| 4829 | 3969 | reply->op = ack_prepare_op; | |
| 4830 |
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3969 | safe_app_data_copy(&reply, p->acceptor.msg->a); |
| 4831 | } else { | ||
| 4832 | IFDBG(D_NONE, FN; STRLIT(" no value synode "); SYCEXP(synode)); | ||
| 4833 | 32365 | reply->op = ack_prepare_empty_op; | |
| 4834 | } | ||
| 4835 | 36334 | return reply; | |
| 4836 | } | ||
| 4837 | |||
| 4838 | 39397 | pax_msg *handle_simple_prepare(pax_machine *p, pax_msg *pm, synode_no synode) { | |
| 4839 | 39397 | pax_msg *reply = nullptr; | |
| 4840 |
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39397 | if (finished(p)) { /* We have learned a value */ |
| 4841 | IFDBG(D_NONE, FN; SYCEXP(synode); BALCEXP(pm->proposal); | ||
| 4842 | NDBG(finished(p), d)); | ||
| 4843 | 3030 | reply = create_learn_msg_for_ignorant_node(p, pm, synode); | |
| 4844 | } else { | ||
| 4845 | int greater = | ||
| 4846 | 36367 | gt_ballot(pm->proposal, | |
| 4847 | p->acceptor.promise); /* Paxos acceptor phase 1 decision */ | ||
| 4848 | IFDBG(D_NONE, FN; SYCEXP(synode); BALCEXP(pm->proposal); NDBG(greater, d)); | ||
| 4849 |
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36367 | if (greater || noop_match(p, pm)) { |
| 4850 | 36334 | p->last_modified = task_now(); | |
| 4851 |
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36334 | if (greater) { |
| 4852 | 36334 | p->acceptor.promise = pm->proposal; /* promise to not accept any less */ | |
| 4853 | } | ||
| 4854 | 36334 | reply = create_ack_prepare_msg(p, pm, synode); | |
| 4855 | } | ||
| 4856 | } | ||
| 4857 | 39397 | return reply; | |
| 4858 | } | ||
| 4859 | |||
| 4860 | /* Handle incoming prepare */ | ||
| 4861 | 39388 | static void handle_prepare(site_def const *site, pax_machine *p, | |
| 4862 | linkage *reply_queue, pax_msg *pm) { | ||
| 4863 | ADD_DBG(D_CONS, add_synode_event(p->synode); | ||
| 4864 | add_event(EVENT_DUMP_PAD, string_arg("pm->from")); | ||
| 4865 | add_event(EVENT_DUMP_PAD, uint_arg(pm->from)); | ||
| 4866 | add_event(EVENT_DUMP_PAD, string_arg(pax_op_to_str(pm->op))); | ||
| 4867 | add_event(EVENT_DUMP_PAD, string_arg("proposal")); | ||
| 4868 | add_ballot_event(pm->proposal); | ||
| 4869 | add_event(EVENT_DUMP_PAD, string_arg("promise")); | ||
| 4870 | add_ballot_event(p->acceptor.promise);); | ||
| 4871 | IFDBG(D_NONE, FN; BALCEXP(pm->proposal); BALCEXP(p->acceptor.promise); | ||
| 4872 | if (p->acceptor.msg) BALCEXP(p->acceptor.msg->proposal); | ||
| 4873 | STRLIT("type "); STRLIT(pax_msg_type_to_str(pm->msg_type))); | ||
| 4874 | |||
| 4875 | { | ||
| 4876 |
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39388 | pax_msg *reply = handle_simple_prepare(p, pm, pm->synode); |
| 4877 |
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39388 | if (reply != nullptr) SEND_REPLY; |
| 4878 | } | ||
| 4879 | 39388 | } | |
| 4880 | |||
| 4881 | 61554 | bool_t check_propose(site_def const *site, pax_machine *p) { | |
| 4882 | IFDBG(D_NONE, FN; SYCEXP(p->synode); | ||
| 4883 | COPY_AND_FREE_GOUT(dbg_machine_nodeset(p, get_maxnodes(site)));); | ||
| 4884 | PAX_MSG_SANITY_CHECK(p->proposer.msg); | ||
| 4885 | { | ||
| 4886 | 61554 | bool_t can_propose = FALSE; | |
| 4887 |
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61554 | if (prep_majority(site, p)) { |
| 4888 | 20695 | p->proposer.msg->proposal = p->proposer.bal; | |
| 4889 | 20695 | BIT_ZERO(p->proposer.prop_nodeset); | |
| 4890 | 20695 | p->proposer.msg->synode = p->synode; | |
| 4891 | 20695 | init_propose_msg(p->proposer.msg); | |
| 4892 | 20695 | p->proposer.sent_prop = p->proposer.bal; | |
| 4893 | 20695 | can_propose = TRUE; | |
| 4894 | } | ||
| 4895 | 61554 | return can_propose; | |
| 4896 | } | ||
| 4897 | } | ||
| 4898 | |||
| 4899 | 424161 | static bool learn_ok(site_def const *site, pax_machine const *p) { | |
| 4900 |
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424161 | return get_nodeno(site) != VOID_NODE_NO && prop_majority(site, p); |
| 4901 | } | ||
| 4902 | |||
| 4903 | 212316 | static pax_msg *check_learn(site_def const *site, pax_machine *p) { | |
| 4904 | IFDBG(D_NONE, FN; SYCEXP(p->synode); | ||
| 4905 | COPY_AND_FREE_GOUT(dbg_machine_nodeset(p, get_maxnodes(site)));); | ||
| 4906 | PAX_MSG_SANITY_CHECK(p->proposer.msg); | ||
| 4907 | { | ||
| 4908 | 212316 | pax_msg *learn_msg = nullptr; | |
| 4909 |
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212316 | if (learn_ok(site, p)) { |
| 4910 | 118274 | p->proposer.msg->synode = p->synode; | |
| 4911 |
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118274 | if (p->proposer.msg->receivers) free_bit_set(p->proposer.msg->receivers); |
| 4912 | 118274 | p->proposer.msg->receivers = clone_bit_set(p->proposer.prep_nodeset); | |
| 4913 | 118274 | BIT_SET(get_nodeno(site), p->proposer.msg->receivers); | |
| 4914 | if (no_duplicate_payload) { | ||
| 4915 | 118274 | learn_msg = create_tiny_learn_msg(p, p->proposer.msg); | |
| 4916 | } else { | ||
| 4917 | /* purecov: begin deadcode */ | ||
| 4918 | init_learn_msg(p->proposer.msg); | ||
| 4919 | learn_msg = p->proposer.msg; | ||
| 4920 | /* purecov: end */ | ||
| 4921 | } | ||
| 4922 | 118274 | p->proposer.sent_learn = p->proposer.bal; | |
| 4923 | } | ||
| 4924 | 212316 | return learn_msg; | |
| 4925 | } | ||
| 4926 | } | ||
| 4927 | |||
| 4928 | 599450 | static void do_learn(site_def const *site [[maybe_unused]], pax_machine *p, | |
| 4929 | pax_msg *m) { | ||
| 4930 | ADD_DBG(D_CONS, add_synode_event(p->synode); | ||
| 4931 | add_event(EVENT_DUMP_PAD, string_arg("m->from")); | ||
| 4932 | add_event(EVENT_DUMP_PAD, uint_arg(m->from)); | ||
| 4933 | add_event(EVENT_DUMP_PAD, string_arg(pax_op_to_str(m->op))); | ||
| 4934 | add_event(EVENT_DUMP_PAD, string_arg("proposal")); | ||
| 4935 | add_ballot_event(m->proposal); | ||
| 4936 | add_event(EVENT_DUMP_PAD, string_arg("promise")); | ||
| 4937 | add_ballot_event(p->acceptor.promise);); | ||
| 4938 | /* FN; SYCEXP(p->synode); SYCEXP(m->synode); STRLIT(NEWLINE); */ | ||
| 4939 | IFDBG(D_NONE, FN; SYCEXP(p->synode); SYCEXP(m->synode); | ||
| 4940 | dbg_bitset(m->receivers, get_maxnodes(site));); | ||
| 4941 |
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599450 | if (m->a) m->a->chosen = TRUE; |
| 4942 | 599450 | replace_pax_msg(&p->acceptor.msg, m); | |
| 4943 | 599450 | replace_pax_msg(&p->learner.msg, m); | |
| 4944 | /* | ||
| 4945 | Track memory used by client data in the cache. | ||
| 4946 | If we do not care about instances that are being decided, | ||
| 4947 | it is only necessary to compute the added memory when we | ||
| 4948 | record the outcome of a consensus round. | ||
| 4949 | */ | ||
| 4950 | 599450 | add_cache_size(p); | |
| 4951 | /* Shrink the cache size if necessary */ | ||
| 4952 | 599450 | shrink_cache(); | |
| 4953 | 599450 | } | |
| 4954 | |||
| 4955 | 35102 | bool_t handle_simple_ack_prepare(site_def const *site, pax_machine *p, | |
| 4956 | pax_msg *m) { | ||
| 4957 |
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35102 | if (get_nodeno(site) != VOID_NODE_NO) |
| 4958 | 35102 | BIT_SET(m->from, p->proposer.prep_nodeset); | |
| 4959 | |||
| 4960 | { | ||
| 4961 | 35102 | bool_t can_propose = FALSE; | |
| 4962 |
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|
38950 | if (m->op == ack_prepare_op && |
| 4963 |
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|
3848 | gt_ballot(m->proposal, p->proposer.msg->proposal)) { /* greater */ |
| 4964 | 28 | replace_pax_msg(&p->proposer.msg, m); | |
| 4965 |
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|
28 | assert(p->proposer.msg); |
| 4966 | } | ||
| 4967 |
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|
35102 | if (gt_ballot(m->reply_to, p->proposer.sent_prop)) { |
| 4968 | 34952 | can_propose = check_propose(site, p); | |
| 4969 | } | ||
| 4970 | 35102 | return can_propose; | |
| 4971 | } | ||
| 4972 | } | ||
| 4973 | |||
| 4974 | /* Other node has already accepted a value */ | ||
| 4975 | 36251 | static void handle_ack_prepare(site_def const *site, pax_machine *p, | |
| 4976 | pax_msg *m) { | ||
| 4977 | ADD_DBG(D_CONS, add_synode_event(p->synode); | ||
| 4978 | add_event(EVENT_DUMP_PAD, string_arg("m->from")); | ||
| 4979 | add_event(EVENT_DUMP_PAD, uint_arg(m->from)); | ||
| 4980 | add_event(EVENT_DUMP_PAD, string_arg(pax_op_to_str(m->op)));); | ||
| 4981 |
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|
36251 | assert(m); |
| 4982 | IFDBG(D_NONE, FN; if (p->proposer.msg) BALCEXP(p->proposer.msg->proposal); | ||
| 4983 | BALCEXP(p->proposer.bal); BALCEXP(m->reply_to); | ||
| 4984 | BALCEXP(p->proposer.sent_prop); SYCEXP(m->synode)); | ||
| 4985 | /* | ||
| 4986 | If the node is preparing a Noop for another node's slot, it is possible | ||
| 4987 | that the leader of the slot has since proposed a value. Hence, there is | ||
| 4988 | no need to move forward if we know that the value has been accepted. This | ||
| 4989 | also prevents changing the size of a learned pax_machine, which would | ||
| 4990 | cause inconsistent reporting of memory usage in P_S. | ||
| 4991 | */ | ||
| 4992 |
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36251 | if (finished(p)) return; |
| 4993 | |||
| 4994 |
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|
70338 | if (m->from != VOID_NODE_NO && |
| 4995 |
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|
35169 | eq_ballot(p->proposer.bal, m->reply_to)) { /* answer to my prepare */ |
| 4996 | 35093 | bool_t can_propose = handle_simple_ack_prepare(site, p, m); | |
| 4997 |
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|
35093 | if (can_propose) send_propose_msg(p->proposer.msg); |
| 4998 | } | ||
| 4999 | } | ||
| 5000 | |||
| 5001 | /* #define AUTO_MSG(p,synode) {if(!(p)){replace_pax_msg(&(p), | ||
| 5002 | * pax_msg_new(synode, site));} */ | ||
| 5003 | |||
| 5004 | 234532 | static pax_msg *create_ack_accept_msg(pax_msg *m, synode_no synode) { | |
| 5005 |
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234532 | CREATE_REPLY(m); |
| 5006 | 234532 | reply->op = ack_accept_op; | |
| 5007 | 234532 | reply->synode = synode; | |
| 5008 | 234532 | return reply; | |
| 5009 | } | ||
| 5010 | |||
| 5011 | 239005 | pax_msg *handle_simple_accept(pax_machine *p, pax_msg *m, synode_no synode) { | |
| 5012 | 239005 | pax_msg *reply = nullptr; | |
| 5013 |
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|
239005 | if (finished(p)) { /* We have learned a value */ |
| 5014 | 4473 | reply = create_learn_msg_for_ignorant_node(p, m, synode); | |
| 5015 | 234532 | } else if (!gt_ballot(p->acceptor.promise, | |
| 5016 |
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|
234532 | m->proposal) || /* Paxos acceptor phase 2 decision */ |
| 5017 | ✗ | noop_match(p, m)) { | |
| 5018 | IFDBG(D_NONE, FN; SYCEXP(m->synode); STRLIT("accept "); | ||
| 5019 | BALCEXP(m->proposal)); | ||
| 5020 | 234532 | p->last_modified = task_now(); | |
| 5021 | 234532 | replace_pax_msg(&p->acceptor.msg, m); | |
| 5022 | 234532 | reply = create_ack_accept_msg(m, synode); | |
| 5023 | } | ||
| 5024 | 239005 | return reply; | |
| 5025 | } | ||
| 5026 | |||
| 5027 | /* Accecpt value if promise is not greater */ | ||
| 5028 | 238990 | static void handle_accept(site_def const *site, pax_machine *p, | |
| 5029 | linkage *reply_queue, pax_msg *m) { | ||
| 5030 | IFDBG(D_NONE, FN; BALCEXP(p->acceptor.promise); BALCEXP(m->proposal); | ||
| 5031 | STREXP(pax_msg_type_to_str(m->msg_type))); | ||
| 5032 | PAX_MSG_SANITY_CHECK(m); | ||
| 5033 | ADD_DBG(D_CONS, add_synode_event(p->synode); | ||
| 5034 | add_event(EVENT_DUMP_PAD, string_arg("m->from")); | ||
| 5035 | add_event(EVENT_DUMP_PAD, uint_arg(m->from)); | ||
| 5036 | add_event(EVENT_DUMP_PAD, string_arg(pax_op_to_str(m->op))); | ||
| 5037 | add_event(EVENT_DUMP_PAD, string_arg("proposal")); | ||
| 5038 | add_ballot_event(m->proposal); | ||
| 5039 | add_event(EVENT_DUMP_PAD, string_arg("promise")); | ||
| 5040 | add_ballot_event(p->acceptor.promise);); | ||
| 5041 | |||
| 5042 | { | ||
| 5043 |
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238990 | pax_msg *reply = handle_simple_accept(p, m, m->synode); |
| 5044 |
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238990 | if (reply != nullptr) { |
| 5045 |
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|
238990 | SEND_REPLY; |
| 5046 | IFDBG(D_CONS, FN; STRLIT("activating sweeper on accept of "); | ||
| 5047 | SYCEXP(m->synode)); | ||
| 5048 |
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|
238990 | activate_sweeper(); |
| 5049 | } | ||
| 5050 | } | ||
| 5051 | 238990 | } | |
| 5052 | |||
| 5053 | /* Handle answer to accept */ | ||
| 5054 | 234846 | pax_msg *handle_simple_ack_accept(site_def const *site, pax_machine *p, | |
| 5055 | pax_msg *m) { | ||
| 5056 | 234846 | pax_msg *learn_msg = nullptr; | |
| 5057 |
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|
469692 | if (get_nodeno(site) != VOID_NODE_NO && m->from != VOID_NODE_NO && |
| 5058 |
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|
234846 | eq_ballot(p->proposer.bal, m->reply_to)) { /* answer to my accept */ |
| 5059 | 234831 | BIT_SET(m->from, p->proposer.prop_nodeset); | |
| 5060 |
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|
234831 | if (gt_ballot(m->proposal, p->proposer.sent_learn)) { |
| 5061 | 212316 | learn_msg = check_learn(site, p); | |
| 5062 | } | ||
| 5063 | } | ||
| 5064 | 234846 | return learn_msg; | |
| 5065 | } | ||
| 5066 | 234831 | static void handle_ack_accept(site_def const *site, pax_machine *p, | |
| 5067 | pax_msg *m) { | ||
| 5068 | ADD_DBG(D_CONS, add_synode_event(p->synode); | ||
| 5069 | add_event(EVENT_DUMP_PAD, string_arg("m->from")); | ||
| 5070 | add_event(EVENT_DUMP_PAD, uint_arg(m->from)); | ||
| 5071 | add_event(EVENT_DUMP_PAD, string_arg(pax_op_to_str(m->op)));); | ||
| 5072 | IFDBG(D_NONE, FN; SYCEXP(m->synode); BALCEXP(p->proposer.bal); | ||
| 5073 | BALCEXP(p->proposer.sent_learn); BALCEXP(m->proposal); | ||
| 5074 | BALCEXP(m->reply_to);); | ||
| 5075 | IFDBG(D_NONE, FN; SYCEXP(p->synode); | ||
| 5076 | if (p->acceptor.msg) BALCEXP(p->acceptor.msg->proposal); | ||
| 5077 | BALCEXP(p->proposer.bal); BALCEXP(m->reply_to);); | ||
| 5078 | |||
| 5079 | { | ||
| 5080 | 234831 | pax_msg *learn_msg = handle_simple_ack_accept(site, p, m); | |
| 5081 |
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234831 | if (learn_msg != nullptr) { |
| 5082 |
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118268 | if (learn_msg->op == tiny_learn_op) { |
| 5083 | 118268 | send_tiny_learn_msg(site, learn_msg); | |
| 5084 | } else { | ||
| 5085 | /* purecov: begin deadcode */ | ||
| 5086 | ✗ | assert(learn_msg->op == learn_op); | |
| 5087 | ✗ | send_learn_msg(site, learn_msg); | |
| 5088 | /* purecov: end */ | ||
| 5089 | } | ||
| 5090 | } | ||
| 5091 | } | ||
| 5092 | 234831 | } | |
| 5093 | |||
| 5094 | /* Handle incoming learn. */ | ||
| 5095 | static void activate_sweeper(); | ||
| 5096 | 215634 | void handle_tiny_learn(site_def const *site, pax_machine *pm, pax_msg *p) { | |
| 5097 |
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215634 | assert(p->msg_type != no_op); |
| 5098 |
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|
215634 | if (pm->acceptor.msg) { |
| 5099 | /* BALCEXP(pm->acceptor.msg->proposal); */ | ||
| 5100 |
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|
215369 | if (eq_ballot(pm->acceptor.msg->proposal, p->proposal)) { |
| 5101 | 215366 | pm->acceptor.msg->op = learn_op; | |
| 5102 | 215366 | pm->last_modified = task_now(); | |
| 5103 | 215366 | update_max_synode(p); | |
| 5104 | 215366 | paxos_fsm(pm, site, paxos_learn, p); | |
| 5105 | 215366 | handle_learn(site, pm, pm->acceptor.msg); | |
| 5106 | } else { | ||
| 5107 | 3 | send_read(p->synode); | |
| 5108 | IFDBG(D_NONE, FN; STRLIT("tiny_learn"); SYCEXP(p->synode); | ||
| 5109 | BALCEXP(pm->acceptor.msg->proposal); BALCEXP(p->proposal)); | ||
| 5110 | } | ||
| 5111 | } else { | ||
| 5112 | 265 | send_read(p->synode); | |
| 5113 | IFDBG(D_NONE, FN; STRLIT("tiny_learn"); SYCEXP(p->synode); | ||
| 5114 | BALCEXP(p->proposal)); | ||
| 5115 | } | ||
| 5116 | 215634 | } | |
| 5117 | |||
| 5118 | 6429 | static void force_pax_machine(pax_machine *p, int enforcer) { | |
| 5119 |
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|
6429 | if (!p->enforcer) { /* Not if already marked as forcing node */ |
| 5120 |
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|
1763 | if (enforcer) { /* Only if forcing node */ |
| 5121 | /* Increase ballot count with a large increment without overflowing */ | ||
| 5122 | /* p->proposer.bal.cnt may be -1. */ | ||
| 5123 | 1501 | int32_t delta = (INT32_MAX - MAX(p->proposer.bal.cnt, 0)) / 3; | |
| 5124 | 1501 | p->proposer.bal.cnt += delta; | |
| 5125 | } | ||
| 5126 | } | ||
| 5127 | 6429 | p->force_delivery = 1; | |
| 5128 | 6429 | p->enforcer = enforcer; | |
| 5129 | 6429 | } | |
| 5130 | |||
| 5131 | /* Configure all messages in interval start, end to be forced */ | ||
| 5132 | 57 | static void force_interval(synode_no start, synode_no end, int enforcer) { | |
| 5133 |
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|
2403 | while (!synode_gt(start, end)) { |
| 5134 | 2346 | pax_machine *p = get_cache(start); | |
| 5135 |
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|
2346 | if (get_nodeno(find_site_def(start)) == VOID_NODE_NO) break; |
| 5136 | |||
| 5137 | /* The forcing node will call force_interval twice, first when | ||
| 5138 | the new config is originally installed, and again when it | ||
| 5139 | receives it as an xcom message. start may be the same, but | ||
| 5140 | end will be greater the second time, since it is calculated | ||
| 5141 | based on the message number of the incoming config. Since the forcing | ||
| 5142 | node is the one responsible for delivering all messages until the | ||
| 5143 | start of the new site, it is important that all instances belonging to | ||
| 5144 | the old site are correctly marked. */ | ||
| 5145 | |||
| 5146 |
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|
2346 | if (p->enforcer) enforcer = 1; /* Extend to new instances */ |
| 5147 | 2346 | force_pax_machine(p, enforcer); | |
| 5148 | |||
| 5149 | /* Old nodesets are null and void */ | ||
| 5150 | 2346 | BIT_ZERO(p->proposer.prep_nodeset); | |
| 5151 | 2346 | BIT_ZERO(p->proposer.prop_nodeset); | |
| 5152 | 2346 | start = incr_synode(start); | |
| 5153 | } | ||
| 5154 | 57 | } | |
| 5155 | |||
| 5156 | 57 | static void start_force_config(site_def *s, int enforcer) { | |
| 5157 |
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|
57 | synode_no end = add_event_horizon(s->boot_key); |
| 5158 | |||
| 5159 | IFDBG(D_NONE, FN; SYCEXP(executed_msg); SYCEXP(end)); | ||
| 5160 |
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57 | if (synode_gt(end, max_synode)) set_max_synode(end); |
| 5161 | |||
| 5162 |
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|
57 | free_forced_config_site_def(); |
| 5163 | 57 | wait_forced_config = 0; | |
| 5164 | 57 | forced_config = s; | |
| 5165 |
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|
57 | force_interval(executed_msg, max_synode, |
| 5166 | enforcer); /* Force everything in the pipeline */ | ||
| 5167 | 57 | } | |
| 5168 | |||
| 5169 | /* Learn this value */ | ||
| 5170 | 497973 | void handle_learn(site_def const *site, pax_machine *p, pax_msg *m) { | |
| 5171 | IFDBG(D_NONE, FN; STRLIT("proposer nodeset "); | ||
| 5172 | dbg_bitset(p->proposer.prop_nodeset, get_maxnodes(site));); | ||
| 5173 | IFDBG(D_NONE, FN; STRLIT("receivers "); | ||
| 5174 | dbg_bitset(m->receivers, get_maxnodes(site));); | ||
| 5175 | IFDBG(D_NONE, FN; NDBG(task_now(), f); SYCEXP(p->synode); | ||
| 5176 | COPY_AND_FREE_GOUT(dbg_app_data(m->a));); | ||
| 5177 | |||
| 5178 | PAX_MSG_SANITY_CHECK(m); | ||
| 5179 | 497973 | p->last_modified = task_now(); | |
| 5180 |
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|
497973 | if (!finished(p)) { /* Avoid re-learn */ |
| 5181 | 344274 | activate_sweeper(); | |
| 5182 | 344274 | do_learn(site, p, m); | |
| 5183 | /* Check for special messages */ | ||
| 5184 |
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|
344274 | if (m->a && m->a->body.c_t == unified_boot_type) { |
| 5185 | IFDBG(D_NONE, FN; STRLIT("Got unified_boot "); SYCEXP(p->synode); | ||
| 5186 | SYCEXP(m->synode);); | ||
| 5187 |
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|
837 | XCOM_FSM(x_fsm_net_boot, void_arg(m->a)); |
| 5188 | } | ||
| 5189 | /* See if someone is forcing a new config */ | ||
| 5190 |
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|
344274 | if (m->force_delivery && m->a) { |
| 5191 | IFDBG(D_NONE, FN; STRLIT("Got forced config "); SYCEXP(p->synode); | ||
| 5192 | SYCEXP(m->synode);); | ||
| 5193 | /* Configure all messages from executed_msg until start of new config | ||
| 5194 | as forced messages so they will eventually be finished */ | ||
| 5195 | /* Immediately install this new config */ | ||
| 5196 |
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|
80 | switch (m->a->body.c_t) { |
| 5197 | ✗ | case add_node_type: | |
| 5198 | /* purecov: begin deadcode */ | ||
| 5199 | ✗ | if (should_ignore_forced_config_or_view( | |
| 5200 | ✗ | find_site_def(p->synode)->x_proto)) { | |
| 5201 | ✗ | log_ignored_forced_config(m->a, "handle_learn"); | |
| 5202 | } else { | ||
| 5203 | ✗ | site_def *new_def = handle_add_node(m->a); | |
| 5204 | ✗ | if (new_def) start_force_config(clone_site_def(new_def), 0); | |
| 5205 | } | ||
| 5206 | ✗ | break; | |
| 5207 | /* purecov: end */ | ||
| 5208 | ✗ | case remove_node_type: | |
| 5209 | /* purecov: begin deadcode */ | ||
| 5210 | ✗ | if (should_ignore_forced_config_or_view( | |
| 5211 | ✗ | find_site_def(p->synode)->x_proto)) { | |
| 5212 | ✗ | log_ignored_forced_config(m->a, "handle_learn"); | |
| 5213 | } else { | ||
| 5214 | ✗ | start_force_config(clone_site_def(handle_remove_node(m->a)), 0); | |
| 5215 | } | ||
| 5216 | ✗ | break; | |
| 5217 | /* purecov: end */ | ||
| 5218 | 30 | case force_config_type: | |
| 5219 | 30 | start_force_config(clone_site_def(install_node_group(m->a)), 0); | |
| 5220 | 30 | break; | |
| 5221 | 50 | default: | |
| 5222 | 50 | break; | |
| 5223 | } | ||
| 5224 | } | ||
| 5225 | } | ||
| 5226 | |||
| 5227 | 497973 | task_wakeup(&p->rv); | |
| 5228 | 497973 | } | |
| 5229 | |||
| 5230 | /* Skip this value */ | ||
| 5231 | 256248 | static void handle_skip(site_def const *site, pax_machine *p, pax_msg *m) { | |
| 5232 | /* IFDBG(D_NONE, FN;); */ | ||
| 5233 | /* IFDBG(D_NONE, FN; NDBG(task_now(),f); SYCEXP(p->msg->synode)); */ | ||
| 5234 |
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256248 | if (!finished(p)) { |
| 5235 | 255176 | p->last_modified = task_now(); | |
| 5236 | 255176 | skip_value(m); | |
| 5237 | 255176 | do_learn(site, p, m); | |
| 5238 | } | ||
| 5239 | /* IFDBG(D_NONE, FN; STRLIT("taskwakeup "); SYCEXP(p->msg->synode)); */ | ||
| 5240 | 256248 | task_wakeup(&p->rv); | |
| 5241 | 256248 | } | |
| 5242 | |||
| 5243 | 107464 | static void handle_client_msg(pax_msg *p) { | |
| 5244 |
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107464 | if (!p || p->a == nullptr) /* discard invalid message */ |
| 5245 | ✗ | return; | |
| 5246 | { | ||
| 5247 | 107464 | msg_link *ml = msg_link_new(p, VOID_NODE_NO); | |
| 5248 | |||
| 5249 | /* Put it in the proposer queue */ | ||
| 5250 | ADD_T_EV(task_now(), __FILE__, __LINE__, "handle_client_msg"); | ||
| 5251 | 107464 | channel_put(&prop_input_queue, &ml->l); | |
| 5252 | } | ||
| 5253 | } | ||
| 5254 | |||
| 5255 | #ifdef ACCEPT_SITE_TEST | ||
| 5256 | /* See if we should process an incoming ping from a node. | ||
| 5257 | The purpose is to avoid doing recovery from a node with an obsolete site | ||
| 5258 | definition */ | ||
| 5259 | static int accept_site(site_def const *site) { | ||
| 5260 | site_def *mysite = (site_def *)get_site_def(); | ||
| 5261 | |||
| 5262 | if (site) { | ||
| 5263 | if (!mysite) { | ||
| 5264 | site_def *prev = (site_def *)find_prev_site_def(site->boot_key); | ||
| 5265 | IFDBG( | ||
| 5266 | D_NONE, FN; PTREXP(site); PTREXP(mysite); PTREXP(prev); | ||
| 5267 | SYCEXP(site->boot_key); if (prev) { SYCEXP(prev->boot_key); }); | ||
| 5268 | if (!prev) { | ||
| 5269 | /** alive when no site, no known previous definition, and present in | ||
| 5270 | * new is accepted */ | ||
| 5271 | return (site->boot_key.group_id == 0 | ||
| 5272 | ? 1 | ||
| 5273 | : (xcom_find_node_index((node_list *)&site->nodes) != | ||
| 5274 | VOID_NODE_NO)); | ||
| 5275 | } else { | ||
| 5276 | /** alive when no site, a previous definition of groupid is known, but | ||
| 5277 | * is older than site def, is accepted */ | ||
| 5278 | return synode_gt(site->boot_key, prev->boot_key); | ||
| 5279 | } | ||
| 5280 | } else { | ||
| 5281 | IFDBG(D_NONE, FN; PTREXP(site); PTREXP(mysite); SYCEXP(site->boot_key); | ||
| 5282 | SYCEXP(mysite->boot_key)); | ||
| 5283 | if (get_group_id(site) != get_group_id(mysite)) { | ||
| 5284 | /** alive from different site should never be accepted */ | ||
| 5285 | return 0; | ||
| 5286 | } else { | ||
| 5287 | /** alive from same site should be accepted if boot_key is larger than | ||
| 5288 | * mine */ | ||
| 5289 | node_no my_nodeno = xcom_find_node_index((node_list *)&mysite->nodes); | ||
| 5290 | node_no site_nodeno = xcom_find_node_index((node_list *)&site->nodes); | ||
| 5291 | return (synode_gt(site->boot_key, mysite->boot_key) && | ||
| 5292 | ((my_nodeno != VOID_NODE_NO) || (site_nodeno != VOID_NODE_NO))); | ||
| 5293 | } | ||
| 5294 | } | ||
| 5295 | } | ||
| 5296 | /** Always accept a NULL site */ | ||
| 5297 | IFDBG(D_NONE, FN; PTREXP(site)); | ||
| 5298 | return 1; | ||
| 5299 | } | ||
| 5300 | #endif | ||
| 5301 | |||
| 5302 | /* Handle incoming "need boot" message. */ | ||
| 5303 | /* purecov: begin deadcode */ | ||
| 5304 | ✗ | static inline void handle_boot(site_def const *site, linkage *reply_queue, | |
| 5305 | pax_msg *p) { | ||
| 5306 | /* This should never be TRUE, but validate it instead of asserting. */ | ||
| 5307 | ✗ | if (site == nullptr || site->nodes.node_list_len < 1) { | |
| 5308 | ✗ | G_DEBUG( | |
| 5309 | "handle_boot: Received an unexpected need_boot_op when site == NULL " | ||
| 5310 | "or " | ||
| 5311 | "site->nodes.node_list_len < 1"); | ||
| 5312 | ✗ | return; | |
| 5313 | } | ||
| 5314 | |||
| 5315 | ✗ | if (ALWAYS_HANDLE_NEED_BOOT || should_handle_need_boot(site, p)) { | |
| 5316 | ✗ | handle_need_snapshot(reply_queue, p); | |
| 5317 | } else { | ||
| 5318 | ✗ | G_DEBUG( | |
| 5319 | "Ignoring a need_boot_op message from an XCom incarnation that does " | ||
| 5320 | "not belong to the group."); | ||
| 5321 | } | ||
| 5322 | } | ||
| 5323 | /* purecov: end */ | ||
| 5324 | |||
| 5325 | 1324 | bool_t should_handle_need_boot(site_def const *site, pax_msg *p) { | |
| 5326 | 1324 | bool_t should_handle = FALSE; | |
| 5327 | 1324 | bool_t const sender_advertises_identity = | |
| 5328 |
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|
1324 | (p->a != nullptr && p->a->body.c_t == xcom_boot_type); |
| 5329 | |||
| 5330 | /* | ||
| 5331 | If the message advertises the sender's identity, check if it matches the | ||
| 5332 | membership information. | ||
| 5333 | |||
| 5334 | The sender's identity may not match if, e.g.: | ||
| 5335 | |||
| 5336 | a. The member was already removed, or | ||
| 5337 | b. It is a new incarnation of a crashed member that is yet to be removed. | ||
| 5338 | |||
| 5339 | ...or some other reason. | ||
| 5340 | |||
| 5341 | If it is due to reason (b), we do not want to boot the sender because XCom | ||
| 5342 | only implements a simple fail-stop model. Allowing the sender to rejoin the | ||
| 5343 | group without going through the full remove+add node path could violate | ||
| 5344 | safety because the sender does not remember any previous Paxos acceptances | ||
| 5345 | it acknowledged before crashing. Since the pre-crash incarnation may have | ||
| 5346 | accepted a value for a given synod but the post-crash incarnation has | ||
| 5347 | forgotten that fact, the post-crash incarnation will fail to propagate the | ||
| 5348 | previously accepted value to a higher ballot. Since majorities can overlap | ||
| 5349 | on a single node, if the overlap node is the post-crash incarnation which | ||
| 5350 | has forgotten about the previously accepted value, a higher ballot proposer | ||
| 5351 | may get a different value accepted, leading to conflicting values to be | ||
| 5352 | accepted for different proposers, which is a violation of the safety | ||
| 5353 | properties of the Paxos protocol. | ||
| 5354 | |||
| 5355 | If the sender does not advertise its identity, we boot it unconditionally. | ||
| 5356 | This is for backwards compatibility. | ||
| 5357 | */ | ||
| 5358 |
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|
1324 | if (sender_advertises_identity) { |
| 5359 | 1321 | bool_t const sender_advertises_one_identity = | |
| 5360 | 1321 | (p->a->body.app_u_u.nodes.node_list_len == 1); | |
| 5361 | |||
| 5362 | /* Defensively accept only messages with a single identity. */ | ||
| 5363 |
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|
1321 | if (sender_advertises_one_identity) { |
| 5364 | 1318 | node_address *sender_identity = p->a->body.app_u_u.nodes.node_list_val; | |
| 5365 | |||
| 5366 | 1318 | should_handle = node_exists_with_uid(sender_identity, &site->nodes); | |
| 5367 | } | ||
| 5368 | } else { | ||
| 5369 | 3 | should_handle = TRUE; | |
| 5370 | } | ||
| 5371 | |||
| 5372 | 1324 | return should_handle; | |
| 5373 | } | ||
| 5374 | |||
| 5375 | 1369 | void init_need_boot_op(pax_msg *p, node_address *identity) { | |
| 5376 | 1369 | p->op = need_boot_op; | |
| 5377 |
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|
1369 | if (identity != nullptr) { |
| 5378 | 1366 | p->a = new_app_data(); | |
| 5379 | 1366 | p->a->body.c_t = xcom_boot_type; | |
| 5380 | 1366 | init_node_list(1, identity, &p->a->body.app_u_u.nodes); | |
| 5381 | } | ||
| 5382 | 1369 | } | |
| 5383 | |||
| 5384 | #define PING_GATHERING_TIME_WINDOW 5.0 | ||
| 5385 | #define PINGS_GATHERED_BEFORE_CONNECTION_SHUTDOWN 3 | ||
| 5386 | |||
| 5387 | 399300 | int pre_process_incoming_ping(site_def const *site, pax_msg const *pm, | |
| 5388 | int has_client_already_booted, | ||
| 5389 | double current_time) { | ||
| 5390 | // Yes... it is a ping for me, boot is done and it is a are_you_alive_op | ||
| 5391 | // This means that something wrong is not right... | ||
| 5392 | 399300 | int did_shutdown = 0; | |
| 5393 | |||
| 5394 |
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|
595742 | if ((pm->from != get_nodeno(site)) && has_client_already_booted && |
| 5395 |
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|
196442 | (pm->op == are_you_alive_op)) { |
| 5396 |
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|
3536 | G_DEBUG( |
| 5397 | "Received a ping to myself. This means that something must be wrong " | ||
| 5398 | "in " | ||
| 5399 | "a bi-directional connection") | ||
| 5400 | // Going to kill the connection for that node... | ||
| 5401 |
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|
3536 | if (site && (pm->from < site->nodes.node_list_len)) { |
| 5402 | // This is not the first ping received in the last 5 seconds... | ||
| 5403 | 3536 | if (site->servers[pm->from]->last_ping_received > | |
| 5404 |
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|
3536 | (current_time - PING_GATHERING_TIME_WINDOW)) { |
| 5405 | 1365 | site->servers[pm->from]->number_of_pings_received++; | |
| 5406 | } else { // First ping since at least more than 5 seconds... | ||
| 5407 | 2171 | site->servers[pm->from]->number_of_pings_received = 1; | |
| 5408 | } | ||
| 5409 | |||
| 5410 | 3536 | site->servers[pm->from]->last_ping_received = current_time; | |
| 5411 | |||
| 5412 | // If we keep on receiving periodical pings... lets kill the connection | ||
| 5413 |
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|
6009 | if (is_connected(site->servers[pm->from]->con) && |
| 5414 |
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|
2473 | site->servers[pm->from]->number_of_pings_received == |
| 5415 | PINGS_GATHERED_BEFORE_CONNECTION_SHUTDOWN) { | ||
| 5416 | 121 | shutdown_connection(site->servers[pm->from]->con); | |
| 5417 |
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|
121 | G_WARNING( |
| 5418 | "Shutting down an outgoing connection. This happens because " | ||
| 5419 | "something might be wrong on a bi-directional connection to node " | ||
| 5420 | "%s:%d. Please check the connection status to this member", | ||
| 5421 | site->servers[pm->from]->srv, site->servers[pm->from]->port); | ||
| 5422 | 121 | did_shutdown = 1; | |
| 5423 | } | ||
| 5424 | } | ||
| 5425 | } | ||
| 5426 | |||
| 5427 | 399300 | return did_shutdown; | |
| 5428 | } | ||
| 5429 | |||
| 5430 | /* Handle incoming alive message */ | ||
| 5431 | static double sent_alive = 0.0; | ||
| 5432 | 399240 | static inline void handle_alive(site_def const *site, linkage *reply_queue, | |
| 5433 | pax_msg *pm) { | ||
| 5434 | 399240 | pre_process_incoming_ping(site, pm, client_boot_done, task_now()); | |
| 5435 | |||
| 5436 |
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|
399240 | if (client_boot_done || !(task_now() - sent_alive > 1.0)) /* Already done? */ |
| 5437 | 397880 | return; | |
| 5438 | |||
| 5439 | #ifdef ACCEPT_SITE_TEST | ||
| 5440 | if (!accept_site(site)) return; | ||
| 5441 | #endif | ||
| 5442 | |||
| 5443 | /* Avoid responding to own ping */ | ||
| 5444 |
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|
1360 | if (pm->from == get_nodeno(site) || pm->from == pm->to) return; |
| 5445 | |||
| 5446 | /* | ||
| 5447 | This code will check if the ping is intended to us. | ||
| 5448 | If the encoded node does not exist in the current configuration, | ||
| 5449 | we avoid sending need_boot_op, since it must be from a different | ||
| 5450 | reincarnation of this node. | ||
| 5451 | */ | ||
| 5452 |
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|
1360 | if (site && pm->a && pm->a->body.c_t == xcom_boot_type) { |
| 5453 | IFDBG(D_NONE, FN; | ||
| 5454 | COPY_AND_FREE_GOUT(dbg_list(&pm->a->body.app_u_u.nodes));); | ||
| 5455 | |||
| 5456 | ✗ | if (!node_exists_with_uid(&pm->a->body.app_u_u.nodes.node_list_val[0], | |
| 5457 | ✗ | &get_site_def()->nodes)) | |
| 5458 | ✗ | return; | |
| 5459 | } | ||
| 5460 | |||
| 5461 |
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|
1360 | if (is_dead_site(pm->group_id)) return; /* Avoid dealing with zombies */ |
| 5462 | |||
| 5463 | { | ||
| 5464 |
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|
1360 | CREATE_REPLY(pm); |
| 5465 |
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|
1360 | init_need_boot_op(reply, cfg_app_xcom_get_identity()); |
| 5466 |
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|
1360 | sent_alive = task_now(); |
| 5467 |
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|
1360 | G_INFO( |
| 5468 | "Node has not booted. Requesting an XCom snapshot from node number %d " | ||
| 5469 | "in the current configuration", | ||
| 5470 | pm->from); | ||
| 5471 |
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|
1360 | SEND_REPLY; |
| 5472 | } | ||
| 5473 | IFDBG(D_NONE, FN; STRLIT("sent need_boot_op");); | ||
| 5474 | } | ||
| 5475 | |||
| 5476 | 499327 | static void update_max_synode(pax_msg *p) { | |
| 5477 |
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|
499327 | if (is_dead_site(p->group_id)) return; |
| 5478 |
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|
499324 | if (get_group_id(get_site_def()) == 0 || max_synode.group_id == 0) { |
| 5479 | 22241 | set_max_synode(p->synode); | |
| 5480 |
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|
477083 | } else if (max_synode.group_id == p->synode.group_id) { |
| 5481 |
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|
477083 | if (synode_gt(p->synode, max_synode)) { |
| 5482 | 203449 | set_max_synode(p->synode); | |
| 5483 | } | ||
| 5484 |
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|
477083 | if (synode_gt(p->max_synode, max_synode)) { |
| 5485 | 3786 | set_max_synode(p->max_synode); | |
| 5486 | } | ||
| 5487 | } | ||
| 5488 | } | ||
| 5489 | |||
| 5490 | /* Message dispatch */ | ||
| 5491 | #define BAL_FMT "ballot {cnt %d node %d}" | ||
| 5492 | #define BAL_MEM(x) (x).cnt, (x).node | ||
| 5493 | |||
| 5494 | static int clicnt = 0; | ||
| 5495 | |||
| 5496 | 23 | xcom_event_horizon xcom_get_minimum_event_horizon() { | |
| 5497 | 23 | return EVENT_HORIZON_MIN; | |
| 5498 | } | ||
| 5499 | |||
| 5500 | 23 | xcom_event_horizon xcom_get_maximum_event_horizon() { | |
| 5501 | 23 | return EVENT_HORIZON_MAX; | |
| 5502 | } | ||
| 5503 | |||
| 5504 | /** | ||
| 5505 | * Retrieves the latest event horizon. | ||
| 5506 | * | ||
| 5507 | * There is no specific reason for this method to return the latest event | ||
| 5508 | * horizon instead of the current one. Both would be acceptable results of | ||
| 5509 | * this function, but we had to make a decision of one over the other. | ||
| 5510 | * | ||
| 5511 | * @param[out] event_horizon the latest event horizon | ||
| 5512 | * @retval REQUEST_FAIL XCom is not initialized yet | ||
| 5513 | * @retval REQUEST_OK function was successful and event_horizon contains the | ||
| 5514 | * latest event horizon | ||
| 5515 | */ | ||
| 5516 | 99 | static client_reply_code xcom_get_event_horizon( | |
| 5517 | xcom_event_horizon *event_horizon) { | ||
| 5518 | 99 | site_def const *latest_config = get_site_def(); | |
| 5519 |
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|
99 | if (latest_config == nullptr) return REQUEST_FAIL; |
| 5520 | 99 | *event_horizon = latest_config->event_horizon; | |
| 5521 | 99 | return REQUEST_OK; | |
| 5522 | } | ||
| 5523 | |||
| 5524 | 1673 | static u_int allow_add_node(app_data_ptr a) { | |
| 5525 | /* Get information on the current site definition */ | ||
| 5526 | 1673 | const site_def *new_site_def = get_site_def(); | |
| 5527 | 1673 | const site_def *valid_site_def = find_site_def(executed_msg); | |
| 5528 | |||
| 5529 | /* Get information on the nodes to be added */ | ||
| 5530 | 1673 | u_int nr_nodes_to_add = a->body.app_u_u.nodes.node_list_len; | |
| 5531 | 1673 | node_address *nodes_to_change = a->body.app_u_u.nodes.node_list_val; | |
| 5532 | |||
| 5533 |
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|
1673 | if (check_if_add_node_is_unsafe_against_event_horizon(a)) return 0; |
| 5534 | |||
| 5535 |
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|
1673 | if (unsafe_leaders(a)) { |
| 5536 | ✗ | return 0; | |
| 5537 | } | ||
| 5538 | |||
| 5539 |
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|
1673 | if (add_node_unsafe_against_ipv4_old_nodes(a)) { |
| 5540 | ✗ | G_MESSAGE( | |
| 5541 | "This server is unable to join the group as the NIC used is " | ||
| 5542 | "configured " | ||
| 5543 | "with IPv6 only and there are members in the group that are unable " | ||
| 5544 | "to " | ||
| 5545 | "communicate using IPv6, only IPv4.Please configure this server to " | ||
| 5546 | "join the group using an IPv4 address instead."); | ||
| 5547 | ✗ | return 0; | |
| 5548 | } | ||
| 5549 | |||
| 5550 | { | ||
| 5551 | u_int i; | ||
| 5552 |
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|
2986 | for (i = 0; i < nr_nodes_to_add; i++) { |
| 5553 |
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|
2986 | if (node_exists(&nodes_to_change[i], &new_site_def->nodes) || |
| 5554 |
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|
1313 | node_exists(&nodes_to_change[i], &valid_site_def->nodes)) { |
| 5555 | /* | ||
| 5556 | We are simply ignoring the attempt to add a node to the | ||
| 5557 | group when there is an old incarnation of it, meaning | ||
| 5558 | that the node has crashed and restarted so fastly that | ||
| 5559 | nobody has noticed that it has gone. | ||
| 5560 | |||
| 5561 | In XCOM, the group is not automatically reconfigured | ||
| 5562 | and it is possible to start reusing a node that has | ||
| 5563 | crashed and restarted without reconfiguring the group | ||
| 5564 | by adding the node back to it. | ||
| 5565 | |||
| 5566 | However, this operation may be unsafe because XCOM | ||
| 5567 | does not implement a crash-recovery model and nodes | ||
| 5568 | suffer from amnesia after restarting the service. In | ||
| 5569 | other words this may lead to inconsistency issues in | ||
| 5570 | the paxos protocol. | ||
| 5571 | |||
| 5572 | Unfortunately, preventing that a node is added back | ||
| 5573 | to the system where there is an old incarnation will | ||
| 5574 | not fix this problem since other changes are required. | ||
| 5575 | */ | ||
| 5576 |
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|
360 | G_WARNING( |
| 5577 | "Old incarnation found while trying to " | ||
| 5578 | "add node %s %.*s. Please stop the old node or wait for it to " | ||
| 5579 | "leave the group.", | ||
| 5580 | nodes_to_change[i].address, nodes_to_change[i].uuid.data.data_len, | ||
| 5581 | nodes_to_change[i].uuid.data.data_val); | ||
| 5582 | 360 | return 0; | |
| 5583 | } | ||
| 5584 | } | ||
| 5585 | } | ||
| 5586 | |||
| 5587 | 1313 | return 1; | |
| 5588 | } | ||
| 5589 | |||
| 5590 | 2293 | static u_int allow_remove_node(app_data_ptr a) { | |
| 5591 | /* Get information on the current site definition */ | ||
| 5592 | 2293 | const site_def *new_site_def = get_site_def(); | |
| 5593 | |||
| 5594 | /* Get information on the nodes to be added */ | ||
| 5595 | 2293 | u_int nodes_len = a->body.app_u_u.nodes.node_list_len; | |
| 5596 | 2293 | node_address *nodes_to_change = a->body.app_u_u.nodes.node_list_val; | |
| 5597 | |||
| 5598 | u_int i; | ||
| 5599 |
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|
4538 | for (i = 0; i < nodes_len; i++) { |
| 5600 |
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|
2293 | if (!node_exists_with_uid(&nodes_to_change[i], &new_site_def->nodes)) { |
| 5601 | /* | ||
| 5602 | If the UID does not exist, then 1) the node has already been | ||
| 5603 | removed or 2) it has reincarnated. | ||
| 5604 | */ | ||
| 5605 | /* purecov: begin inspected */ | ||
| 5606 |
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|
48 | if (node_exists(&nodes_to_change[i], &new_site_def->nodes)) { |
| 5607 | /* | ||
| 5608 | We also cannot allow an upper-layer to remove a new incarnation | ||
| 5609 | of a node when it tries to remove an old one. | ||
| 5610 | */ | ||
| 5611 | ✗ | G_MESSAGE( | |
| 5612 | "New incarnation found while trying to " | ||
| 5613 | "remove node %s %.*s.", | ||
| 5614 | nodes_to_change[i].address, nodes_to_change[i].uuid.data.data_len, | ||
| 5615 | nodes_to_change[i].uuid.data.data_val); | ||
| 5616 | } else { | ||
| 5617 | /* The node has already been removed, so we block the request */ | ||
| 5618 |
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48 | G_MESSAGE( |
| 5619 | "Node has already been removed: " | ||
| 5620 | "%s %.*s.", | ||
| 5621 | nodes_to_change[i].address, nodes_to_change[i].uuid.data.data_len, | ||
| 5622 | nodes_to_change[i].uuid.data.data_val); | ||
| 5623 | } | ||
| 5624 | 48 | return 0; | |
| 5625 | /* purecov: end */ | ||
| 5626 | } | ||
| 5627 | } | ||
| 5628 | |||
| 5629 | 2245 | return 1; | |
| 5630 | } | ||
| 5631 | |||
| 5632 | /** | ||
| 5633 | * Logs the fact that an add/remove node request is aimed at another group. | ||
| 5634 | * | ||
| 5635 | * @param a a pointer to the app_data of the configuration command | ||
| 5636 | * @param message_fmt a formatted message to log, containing a single %s that | ||
| 5637 | * will be replaced by the node's address | ||
| 5638 | */ | ||
| 5639 | 92 | static void log_cfgchange_wrong_group(app_data_ptr a, | |
| 5640 | const char *const message_fmt) { | ||
| 5641 | 92 | u_int const nr_nodes = a->body.app_u_u.nodes.node_list_len; | |
| 5642 | u_int i; | ||
| 5643 |
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|
184 | for (i = 0; i < nr_nodes; i++) { |
| 5644 | 92 | char const *const address = a->body.app_u_u.nodes.node_list_val[i].address; | |
| 5645 |
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|
92 | G_WARNING(message_fmt, address); |
| 5646 | } | ||
| 5647 | 92 | } | |
| 5648 | |||
| 5649 | /** | ||
| 5650 | * Validates if a configuration command can be executed. | ||
| 5651 | * Checks whether the configuration command is aimed at the correct group. | ||
| 5652 | * Checks whether the configuration command pertains to a node reincarnation. | ||
| 5653 | * | ||
| 5654 | * @param p a pointer to the pax_msg of the configuration command | ||
| 5655 | * @retval REQUEST_OK if the reconfiguration command can be executed | ||
| 5656 | * @retval REQUEST_RETRY if XCom is still booting | ||
| 5657 | * @retval REQUEST_FAIL if the configuration command cannot be executed | ||
| 5658 | */ | ||
| 5659 | 4134 | static client_reply_code can_execute_cfgchange(pax_msg *p) { | |
| 5660 | 4134 | app_data_ptr a = p->a; | |
| 5661 | |||
| 5662 |
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|
4134 | if (executed_msg.msgno <= 2) { |
| 5663 | // If we have not booted and we receive an add_node that contains us... | ||
| 5664 | ✗ | if (add_node_adding_own_address(a)) | |
| 5665 | ✗ | return REQUEST_FAIL; | |
| 5666 | else { | ||
| 5667 | /*G_INFO( | ||
| 5668 | "Configuration change failed. Request on a node that has not booted " | ||
| 5669 | "yet.");*/ | ||
| 5670 | ✗ | G_INFO( | |
| 5671 | "This node received a Configuration change request, but it not yet " | ||
| 5672 | "started. This could happen if one starts several nodes " | ||
| 5673 | "simultaneously. This request will be retried by whoever sent it."); | ||
| 5674 | ✗ | return REQUEST_RETRY; | |
| 5675 | } | ||
| 5676 | } | ||
| 5677 | |||
| 5678 |
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|
4134 | if (a && a->group_id != 0 && a->group_id != executed_msg.group_id) { |
| 5679 |
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|
92 | switch (a->body.c_t) { |
| 5680 | 92 | case add_node_type: | |
| 5681 | 92 | log_cfgchange_wrong_group( | |
| 5682 | a, | ||
| 5683 | "The request to add %s to the group has been rejected because it " | ||
| 5684 | "is aimed at another group"); | ||
| 5685 | 92 | break; | |
| 5686 | ✗ | case remove_node_type: | |
| 5687 | ✗ | log_cfgchange_wrong_group(a, | |
| 5688 | "The request to remove %s from the group " | ||
| 5689 | "has been rejected because " | ||
| 5690 | "it is aimed at another group"); | ||
| 5691 | ✗ | break; | |
| 5692 | ✗ | case force_config_type: | |
| 5693 | ✗ | G_WARNING( | |
| 5694 | "The request to force the group membership has been rejected " | ||
| 5695 | "because it is aimed at another group"); | ||
| 5696 | ✗ | break; | |
| 5697 | ✗ | case set_max_leaders: | |
| 5698 | ✗ | G_WARNING( | |
| 5699 | "The request to change max number of leaders has been rejected " | ||
| 5700 | "because it is aimed at another group"); | ||
| 5701 | ✗ | break; | |
| 5702 | ✗ | case set_leaders_type: | |
| 5703 | ✗ | G_WARNING( | |
| 5704 | "The request to change leaders has been rejected " | ||
| 5705 | "because it is aimed at another group"); | ||
| 5706 | ✗ | break; | |
| 5707 | ✗ | default: | |
| 5708 | ✗ | assert(0 && | |
| 5709 | "A cargo_type different from {add_node_type, remove_node_type, " | ||
| 5710 | "force_config_type, set_max_leaders, set_leaders_type} should " | ||
| 5711 | "not " | ||
| 5712 | "have hit this code path"); | ||
| 5713 | } | ||
| 5714 | 92 | return REQUEST_FAIL; | |
| 5715 | } | ||
| 5716 | |||
| 5717 |
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|
4042 | if (a && a->body.c_t == add_node_type && !allow_add_node(a)) |
| 5718 | 360 | return REQUEST_FAIL; | |
| 5719 | |||
| 5720 |
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|
3682 | if (a && a->body.c_t == remove_node_type && !allow_remove_node(a)) |
| 5721 | 48 | return REQUEST_FAIL; | |
| 5722 | |||
| 5723 |
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|
3643 | if (a && a->body.c_t == set_event_horizon_type && |
| 5724 |
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|
9 | is_unsafe_event_horizon_reconfiguration(a)) |
| 5725 | ✗ | return REQUEST_FAIL; | |
| 5726 | |||
| 5727 |
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|
3662 | if (a && a->body.c_t == force_config_type && |
| 5728 |
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|
28 | are_there_dead_nodes_in_new_config(a)) |
| 5729 | 1 | return REQUEST_FAIL; | |
| 5730 | |||
| 5731 | 7266 | if (a && | |
| 5732 |
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|
3672 | (a->body.c_t == set_max_leaders || a->body.c_t == set_leaders_type) && |
| 5733 |
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|
39 | is_unsafe_leaders_reconfiguration(a)) |
| 5734 | ✗ | return REQUEST_FAIL; | |
| 5735 | |||
| 5736 | 3633 | return REQUEST_OK; | |
| 5737 | } | ||
| 5738 | |||
| 5739 | 831042 | static void activate_sweeper() { | |
| 5740 |
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|
831042 | if (sweeper) { |
| 5741 | ADD_DBG(D_CONS, add_event(EVENT_DUMP_PAD, | ||
| 5742 | string_arg("sweeper activated max_synode")); | ||
| 5743 | add_synode_event(max_synode);); | ||
| 5744 | 783355 | task_activate(sweeper); | |
| 5745 | } | ||
| 5746 | 831042 | } | |
| 5747 | |||
| 5748 | static synode_no start_config = NULL_SYNODE; | ||
| 5749 | |||
| 5750 | 99 | void dispatch_get_event_horizon(site_def const *site, pax_msg *p, | |
| 5751 | linkage *reply_queue) { | ||
| 5752 |
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99 | CREATE_REPLY(p); |
| 5753 | IFDBG(D_NONE, FN; STRLIT("Got get_event_horizon from client"); | ||
| 5754 | SYCEXP(p->synode);); | ||
| 5755 | 99 | reply->op = xcom_client_reply; | |
| 5756 |
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99 | reply->cli_err = xcom_get_event_horizon(&reply->event_horizon); |
| 5757 |
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|
99 | SEND_REPLY; |
| 5758 | 99 | } | |
| 5759 | |||
| 5760 | 85 | static reply_data *new_leader_info(site_def *site) { | |
| 5761 |
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85 | if (site) { |
| 5762 | reply_data *data = | ||
| 5763 | 85 | static_cast<reply_data *>(xcom_calloc((size_t)1, sizeof(reply_data))); | |
| 5764 | 85 | data->rt = leader_info; | |
| 5765 | 85 | data->reply_data_u.leaders.max_nr_leaders = site->max_active_leaders; | |
| 5766 |
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85 | if (leaders_set_by_client(site)) { |
| 5767 | data->reply_data_u.leaders.preferred_leaders = | ||
| 5768 | 32 | clone_leader_array(site->leaders); | |
| 5769 | } | ||
| 5770 | 85 | active_leaders(site, &data->reply_data_u.leaders.actual_leaders); | |
| 5771 | 85 | return data; | |
| 5772 | } else { | ||
| 5773 | ✗ | return nullptr; | |
| 5774 | } | ||
| 5775 | } | ||
| 5776 | |||
| 5777 | 85 | void dispatch_get_leaders(site_def *site, pax_msg *p, linkage *reply_queue) { | |
| 5778 |
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85 | CREATE_REPLY(p); |
| 5779 | IFDBG(D_NONE, FN; STRLIT("Got get_leaders from client"); SYCEXP(p->synode);); | ||
| 5780 | 85 | reply->op = xcom_client_reply; | |
| 5781 |
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85 | reply->rd = new_leader_info(site); |
| 5782 | 85 | reply->cli_err = reply->rd ? REQUEST_OK : REQUEST_FAIL; | |
| 5783 |
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|
85 | SEND_REPLY; |
| 5784 | 85 | } | |
| 5785 | |||
| 5786 | /* | ||
| 5787 | * Log the result of the get_synode_app_data command. | ||
| 5788 | */ | ||
| 5789 | ✗ | static void log_get_synode_app_data_failure( | |
| 5790 | xcom_get_synode_app_data_result error_code) { | ||
| 5791 | ✗ | switch (error_code) { | |
| 5792 | ✗ | case XCOM_GET_SYNODE_APP_DATA_OK: | |
| 5793 | ✗ | break; | |
| 5794 | ✗ | case XCOM_GET_SYNODE_APP_DATA_ERROR: | |
| 5795 | ✗ | G_DEBUG("Could not reply successfully to request for synode data."); | |
| 5796 | ✗ | break; | |
| 5797 | ✗ | case XCOM_GET_SYNODE_APP_DATA_NOT_CACHED: | |
| 5798 | ✗ | G_DEBUG( | |
| 5799 | "Could not reply successfully to request for synode data because " | ||
| 5800 | "some of the requested synodes are no longer cached."); | ||
| 5801 | ✗ | break; | |
| 5802 | ✗ | case XCOM_GET_SYNODE_APP_DATA_NOT_DECIDED: | |
| 5803 | ✗ | G_DEBUG( | |
| 5804 | "Could not reply successfully to request for synode data because " | ||
| 5805 | "some of the requested synodes are still undecided."); | ||
| 5806 | ✗ | break; | |
| 5807 | ✗ | case XCOM_GET_SYNODE_APP_DATA_NO_MEMORY: | |
| 5808 | ✗ | G_DEBUG( | |
| 5809 | "Could not reply successfully to request for synode data because " | ||
| 5810 | "memory could not be allocated."); | ||
| 5811 | ✗ | break; | |
| 5812 | } | ||
| 5813 | } | ||
| 5814 | |||
| 5815 | ✗ | void dispatch_get_synode_app_data(site_def const *site, pax_msg *p, | |
| 5816 | linkage *reply_queue) { | ||
| 5817 | IFDBG(D_NONE, FN; STRLIT("Got get_synode_app_data from client"); | ||
| 5818 | SYCEXP(p->synode);); | ||
| 5819 | |||
| 5820 | { | ||
| 5821 | ✗ | CREATE_REPLY(p); | |
| 5822 | ✗ | reply->op = xcom_client_reply; | |
| 5823 | |||
| 5824 | { | ||
| 5825 | xcom_get_synode_app_data_result error_code; | ||
| 5826 | ✗ | error_code = xcom_get_synode_app_data(&p->a->body.app_u_u.synodes, | |
| 5827 | ✗ | &reply->requested_synode_app_data); | |
| 5828 | ✗ | switch (error_code) { | |
| 5829 | ✗ | case XCOM_GET_SYNODE_APP_DATA_OK: | |
| 5830 | ✗ | reply->cli_err = REQUEST_OK; | |
| 5831 | ✗ | break; | |
| 5832 | ✗ | case XCOM_GET_SYNODE_APP_DATA_NOT_CACHED: | |
| 5833 | case XCOM_GET_SYNODE_APP_DATA_NOT_DECIDED: | ||
| 5834 | case XCOM_GET_SYNODE_APP_DATA_NO_MEMORY: | ||
| 5835 | case XCOM_GET_SYNODE_APP_DATA_ERROR: | ||
| 5836 | ✗ | reply->cli_err = REQUEST_FAIL; | |
| 5837 | ✗ | log_get_synode_app_data_failure(error_code); | |
| 5838 | ✗ | break; | |
| 5839 | } | ||
| 5840 | |||
| 5841 | ✗ | SEND_REPLY; | |
| 5842 | } | ||
| 5843 | } | ||
| 5844 | } | ||
| 5845 | |||
| 5846 | static int can_send_snapshot(); | ||
| 5847 | |||
| 5848 | 108152 | static void process_client_msg(site_def const *site, pax_msg *p, | |
| 5849 | linkage *reply_queue) { | ||
| 5850 | 108152 | clicnt++; | |
| 5851 |
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108152 | if (p->a && (p->a->body.c_t == exit_type)) { |
| 5852 | /* purecov: begin deadcode */ | ||
| 5853 | IFDBG(D_NONE, FN; STRLIT("Got exit from client"); SYCEXP(p->synode);); | ||
| 5854 | ✗ | bury_site(get_group_id(get_site_def())); | |
| 5855 | ADD_DBG(D_FSM, add_event(EVENT_DUMP_PAD, string_arg("terminating"));) | ||
| 5856 | ✗ | terminate_and_exit(); | |
| 5857 | ✗ | return; | |
| 5858 | /* purecov: end */ | ||
| 5859 | } | ||
| 5860 | |||
| 5861 |
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|
108152 | if (p->a && (p->a->body.c_t == reset_type)) { |
| 5862 | /* purecov: begin deadcode */ | ||
| 5863 | IFDBG(D_NONE, FN; STRLIT("Got reset from client"); SYCEXP(p->synode);); | ||
| 5864 | ✗ | bury_site(get_group_id(get_site_def())); | |
| 5865 | ADD_DBG(D_FSM, add_event(EVENT_DUMP_PAD, string_arg("terminating"));) | ||
| 5866 | ✗ | XCOM_FSM(x_fsm_terminate, int_arg(0)); | |
| 5867 | ✗ | return; | |
| 5868 | /* purecov: end */ | ||
| 5869 | } | ||
| 5870 |
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108152 | if (p->a && (p->a->body.c_t == remove_reset_type)) { |
| 5871 | /* purecov: begin deadcode */ | ||
| 5872 | IFDBG(D_NONE, FN; STRLIT("Got remove_reset from client"); | ||
| 5873 | SYCEXP(p->synode);); | ||
| 5874 | ADD_DBG(D_FSM, add_event(EVENT_DUMP_PAD, string_arg("terminating"));) | ||
| 5875 | ✗ | XCOM_FSM(x_fsm_terminate, int_arg(0)); | |
| 5876 | ✗ | return; | |
| 5877 | /* purecov: end */ | ||
| 5878 | } | ||
| 5879 |
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108152 | if (p->a && (p->a->body.c_t == enable_arbitrator)) { |
| 5880 | ✗ | CREATE_REPLY(p); | |
| 5881 | IFDBG(D_NONE, FN; STRLIT("Got enable_arbitrator from client"); | ||
| 5882 | SYCEXP(p->synode);); | ||
| 5883 | ✗ | ARBITRATOR_HACK = 1; | |
| 5884 | ✗ | reply->op = xcom_client_reply; | |
| 5885 | ✗ | reply->cli_err = REQUEST_OK; | |
| 5886 | ✗ | SEND_REPLY; | |
| 5887 | ✗ | return; | |
| 5888 | } | ||
| 5889 |
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|
108152 | if (p->a && (p->a->body.c_t == disable_arbitrator)) { |
| 5890 | ✗ | CREATE_REPLY(p); | |
| 5891 | IFDBG(D_NONE, FN; STRLIT("Got disable_arbitrator from client"); | ||
| 5892 | SYCEXP(p->synode);); | ||
| 5893 | ✗ | ARBITRATOR_HACK = 0; | |
| 5894 | ✗ | reply->op = xcom_client_reply; | |
| 5895 | ✗ | reply->cli_err = REQUEST_OK; | |
| 5896 | ✗ | SEND_REPLY; | |
| 5897 | ✗ | return; | |
| 5898 | } | ||
| 5899 |
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108152 | if (p->a && (p->a->body.c_t == set_cache_limit)) { |
| 5900 |
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|
3 | CREATE_REPLY(p); |
| 5901 | IFDBG(D_NONE, FN; STRLIT("Got set_cache_limit from client"); | ||
| 5902 | SYCEXP(p->synode);); | ||
| 5903 |
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|
3 | if (the_app_xcom_cfg) { |
| 5904 |
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|
3 | set_max_cache_size(p->a->body.app_u_u.cache_limit); |
| 5905 | 3 | reply->cli_err = REQUEST_OK; | |
| 5906 | } else { | ||
| 5907 | ✗ | reply->cli_err = REQUEST_FAIL; | |
| 5908 | } | ||
| 5909 | 3 | reply->op = xcom_client_reply; | |
| 5910 |
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3 | SEND_REPLY; |
| 5911 | 3 | return; | |
| 5912 | } | ||
| 5913 |
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108149 | if (p->a && (p->a->body.c_t == x_terminate_and_exit)) { |
| 5914 | /* purecov: begin deadcode */ | ||
| 5915 | ✗ | CREATE_REPLY(p); | |
| 5916 | IFDBG(D_NONE, FN; STRLIT("Got terminate_and_exit from client"); | ||
| 5917 | SYCEXP(p->synode);); | ||
| 5918 | ✗ | reply->op = xcom_client_reply; | |
| 5919 | ✗ | reply->cli_err = REQUEST_OK; | |
| 5920 | ✗ | SEND_REPLY; | |
| 5921 | /* | ||
| 5922 | The function frees sites which is used by SEND_REPLY, | ||
| 5923 | so it should be called after SEND_REPLY. | ||
| 5924 | */ | ||
| 5925 | IFDBG(D_NONE, FN; STRLIT("terminate_and_exit")); | ||
| 5926 | ADD_DBG(D_FSM, add_event(EVENT_DUMP_PAD, string_arg("terminating"));) | ||
| 5927 | ✗ | terminate_and_exit(); | |
| 5928 | ✗ | return; | |
| 5929 | /* purecov: end */ | ||
| 5930 | } | ||
| 5931 |
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108149 | if (p->a && (p->a->body.c_t == get_event_horizon_type)) { |
| 5932 | 99 | dispatch_get_event_horizon(get_site_def(), p, reply_queue); | |
| 5933 | 99 | return; | |
| 5934 | } | ||
| 5935 |
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108050 | if (p->a && (p->a->body.c_t == get_synode_app_data_type)) { |
| 5936 | ✗ | dispatch_get_synode_app_data(get_site_def(), p, reply_queue); | |
| 5937 | ✗ | return; | |
| 5938 | } | ||
| 5939 |
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108050 | if (p->a && (p->a->body.c_t == get_leaders_type)) { |
| 5940 | 85 | dispatch_get_leaders(get_site_def_rw(), p, reply_queue); | |
| 5941 | 85 | return; | |
| 5942 | } | ||
| 5943 |
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107965 | if (p->a && |
| 5944 |
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|
107965 | (p->a->body.c_t == add_node_type || p->a->body.c_t == remove_node_type || |
| 5945 |
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|
103907 | p->a->body.c_t == force_config_type || |
| 5946 |
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|
103879 | p->a->body.c_t == set_event_horizon_type || |
| 5947 |
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|
103870 | p->a->body.c_t == set_max_leaders || |
| 5948 |
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|
103870 | p->a->body.c_t == set_leaders_type)) { |
| 5949 | client_reply_code cli_err; | ||
| 5950 |
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|
4134 | CREATE_REPLY(p); |
| 5951 | 4134 | reply->op = xcom_client_reply; | |
| 5952 |
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|
4134 | reply->cli_err = cli_err = can_execute_cfgchange(p); |
| 5953 |
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|
4134 | SEND_REPLY; |
| 5954 |
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|
4134 | if (cli_err != REQUEST_OK) { |
| 5955 | 501 | return; | |
| 5956 | } | ||
| 5957 | } | ||
| 5958 |
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|
107464 | if (p->a && p->a->body.c_t == unified_boot_type) { |
| 5959 | IFDBG(D_NONE, FN; STRLIT("Got unified_boot from client"); | ||
| 5960 | SYCEXP(p->synode);); | ||
| 5961 | IFDBG(D_NONE, FN; COPY_AND_FREE_GOUT(dbg_list(&p->a->body.app_u_u.nodes));); | ||
| 5962 | IFDBG(D_NONE, STRLIT("handle_client_msg "); NDBG(p->a->group_id, x)); | ||
| 5963 |
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|
837 | XCOM_FSM(x_fsm_net_boot, void_arg(p->a)); |
| 5964 | } | ||
| 5965 |
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|
107464 | if (p->a && p->a->body.c_t == add_node_type) { |
| 5966 | IFDBG(D_NONE, FN; STRLIT("Got add_node from client"); SYCEXP(p->synode);); | ||
| 5967 | IFDBG(D_NONE, FN; COPY_AND_FREE_GOUT(dbg_list(&p->a->body.app_u_u.nodes));); | ||
| 5968 | IFDBG(D_NONE, STRLIT("handle_client_msg "); NDBG(p->a->group_id, x)); | ||
| 5969 |
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|
1313 | assert(get_site_def()); |
| 5970 | } | ||
| 5971 |
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|
107464 | if (p->a && p->a->body.c_t == remove_node_type) { |
| 5972 | IFDBG(D_NONE, FN; STRLIT("Got remove_node from client"); | ||
| 5973 | SYCEXP(p->synode);); | ||
| 5974 | IFDBG(D_NONE, FN; COPY_AND_FREE_GOUT(dbg_list(&p->a->body.app_u_u.nodes));); | ||
| 5975 | IFDBG(D_NONE, STRLIT("handle_client_msg "); NDBG(p->a->group_id, x)); | ||
| 5976 |
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|
2245 | assert(get_site_def()); |
| 5977 | } | ||
| 5978 |
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|
107464 | if (p->a && p->a->body.c_t == set_event_horizon_type) { |
| 5979 | IFDBG(D_NONE, FN; STRLIT("Got set_event_horizon from client"); | ||
| 5980 | SYCEXP(p->synode);); | ||
| 5981 | IFDBG(D_NONE, FN; NDBG(p->a->body.app_u_u.event_horizon, u)); | ||
| 5982 | IFDBG(D_NONE, STRLIT("handle_client_msg "); NDBG(p->a->group_id, x)); | ||
| 5983 |
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|
9 | assert(get_site_def()); |
| 5984 | } | ||
| 5985 |
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|
107464 | if (p->a && p->a->body.c_t == force_config_type) { |
| 5986 | IFDBG(D_NONE, FN; STRLIT("Got new force config from client"); | ||
| 5987 | SYCEXP(p->synode);); | ||
| 5988 | IFDBG(D_NONE, FN; COPY_AND_FREE_GOUT(dbg_list(&p->a->body.app_u_u.nodes));); | ||
| 5989 | IFDBG(D_NONE, STRLIT("handle_client_msg "); NDBG(p->a->group_id, x)); | ||
| 5990 |
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|
27 | assert(get_site_def()); |
| 5991 |
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|
27 | XCOM_FSM(x_fsm_force_config, void_arg(p->a)); |
| 5992 | } | ||
| 5993 |
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|
107464 | if (p->a && p->a->body.c_t == set_max_leaders) { |
| 5994 | IFDBG(D_NONE, FN; STRLIT("Got set_max_leaders from client"); | ||
| 5995 | SYCEXP(p->synode);); | ||
| 5996 | IFDBG(D_NONE, FN; NDBG(p->a->body.app_u_u.max_leaders, u)); | ||
| 5997 | IFDBG(D_NONE, STRLIT("handle_client_msg "); NDBG(p->a->group_id, x)); | ||
| 5998 | ✗ | assert(get_site_def()); | |
| 5999 | } | ||
| 6000 |
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|
107464 | if (p->a && p->a->body.c_t == set_leaders_type) { |
| 6001 | IFDBG(D_NONE, FN; STRLIT("Got set_leaders_type from client"); | ||
| 6002 | SYCEXP(p->synode);); | ||
| 6003 | IFDBG(D_NONE, STRLIT("handle_client_msg "); NDBG(p->a->group_id, x)); | ||
| 6004 |
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|
39 | assert(get_site_def()); |
| 6005 | } | ||
| 6006 | 107464 | handle_client_msg(p); | |
| 6007 | } | ||
| 6008 | |||
| 6009 | 53069 | static void process_prepare_op(site_def const *site, pax_msg *p, | |
| 6010 | linkage *reply_queue) { | ||
| 6011 | 53069 | pax_machine *pm = get_cache(p->synode); | |
| 6012 |
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|
53069 | assert(pm); |
| 6013 |
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|
53069 | if (p->force_delivery) pm->force_delivery = 1; |
| 6014 | IFDBG(D_NONE, FN; dbg_pax_msg(p)); | ||
| 6015 | |||
| 6016 | /* | ||
| 6017 | We can only be a productive Paxos Acceptor if we have been booted, i.e. | ||
| 6018 | added to the group and received an up-to-date snapshot from some member. | ||
| 6019 | |||
| 6020 | We do not allow non-booted members to participate in Paxos because they | ||
| 6021 | might be a reincarnation of a member that crashed and was then brought up | ||
| 6022 | without having gone through the remove+add node path. | ||
| 6023 | Since the pre-crash incarnation may have accepted a value for a given | ||
| 6024 | synod but the post-crash incarnation has forgotten that fact, the | ||
| 6025 | post-crash incarnation will fail to propagate the previously accepted | ||
| 6026 | value to a higher ballot. Since majorities can overlap on a single node, | ||
| 6027 | if the overlap node is the post-crash incarnation which has forgotten | ||
| 6028 | about the previously accepted value, the higher ballot proposer may get | ||
| 6029 | a different value accepted, leading to conflicting values to be accepted | ||
| 6030 | for different proposers, which is a violation of the safety requirements | ||
| 6031 | of the Paxos protocol. | ||
| 6032 | */ | ||
| 6033 |
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|
53069 | if (ALWAYS_HANDLE_CONSENSUS || client_boot_done) { |
| 6034 | 39388 | paxos_fsm(pm, site, paxos_prepare, p); | |
| 6035 | 39388 | handle_prepare(site, pm, reply_queue, p); | |
| 6036 | } | ||
| 6037 | 53069 | } | |
| 6038 | |||
| 6039 | 36251 | static inline int abort_processing(pax_msg *p) { | |
| 6040 | /* Ensure that forced message can be processed */ | ||
| 6041 |
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|
36251 | return (!p->force_delivery && too_far(p->synode)) || !is_cached(p->synode); |
| 6042 | } | ||
| 6043 | |||
| 6044 | 36251 | static void process_ack_prepare_op(site_def const *site, pax_msg *p, | |
| 6045 | linkage *reply_queue) { | ||
| 6046 | (void)reply_queue; | ||
| 6047 |
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|
36251 | if (abort_processing(p)) |
| 6048 | ✗ | return; | |
| 6049 | else { | ||
| 6050 | 36251 | pax_machine *pm = get_cache(p->synode); | |
| 6051 |
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|
36251 | if (p->force_delivery) pm->force_delivery = 1; |
| 6052 |
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|
36251 | if (!pm->proposer.msg) return; |
| 6053 |
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|
36251 | assert(pm && pm->proposer.msg); |
| 6054 | 36251 | handle_ack_prepare(site, pm, p); | |
| 6055 | 36251 | paxos_fsm(pm, site, paxos_ack_prepare, p); | |
| 6056 | } | ||
| 6057 | } | ||
| 6058 | |||
| 6059 | 242683 | static void process_accept_op(site_def const *site, pax_msg *p, | |
| 6060 | linkage *reply_queue) { | ||
| 6061 | 242683 | pax_machine *pm = get_cache(p->synode); | |
| 6062 |
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|
242683 | assert(pm); |
| 6063 |
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|
242683 | if (p->force_delivery) pm->force_delivery = 1; |
| 6064 | IFDBG(D_NONE, FN; dbg_pax_msg(p)); | ||
| 6065 | |||
| 6066 | /* | ||
| 6067 | We can only be a productive Paxos Acceptor if we have been booted, i.e. | ||
| 6068 | added to the group and received an up-to-date snapshot from some member. | ||
| 6069 | |||
| 6070 | We do not allow non-booted members to participate in Paxos because they | ||
| 6071 | might be a reincarnation of a member that crashed and was then brought up | ||
| 6072 | without having gone through the remove+add node path. | ||
| 6073 | Since the pre-crash incarnation may have accepted a value for a given | ||
| 6074 | synod but the post-crash incarnation has forgotten that fact, the | ||
| 6075 | post-crash incarnation will fail to propagate the previously accepted | ||
| 6076 | value to a higher ballot. Since majorities can overlap on a single node, | ||
| 6077 | if the overlap node is the post-crash incarnation which has forgotten | ||
| 6078 | about the previously accepted value, the higher ballot proposer may get | ||
| 6079 | a different value accepted, leading to conflicting values to be accepted | ||
| 6080 | for different proposers, which is a violation of the safety requirements | ||
| 6081 | of the Paxos protocol. | ||
| 6082 | */ | ||
| 6083 |
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|
242683 | if (ALWAYS_HANDLE_CONSENSUS || client_boot_done) { |
| 6084 | 238990 | handle_alive(site, reply_queue, p); | |
| 6085 | |||
| 6086 | 238990 | paxos_fsm(pm, site, paxos_accept, p); | |
| 6087 | 238990 | handle_accept(site, pm, reply_queue, p); | |
| 6088 | } | ||
| 6089 | 242683 | } | |
| 6090 | |||
| 6091 | 234831 | static void process_ack_accept_op(site_def const *site, pax_msg *p, | |
| 6092 | linkage *reply_queue) { | ||
| 6093 | (void)reply_queue; | ||
| 6094 |
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|
234831 | if (too_far(p->synode)) |
| 6095 | ✗ | return; | |
| 6096 | else { | ||
| 6097 | 234831 | pax_machine *pm = get_cache(p->synode); | |
| 6098 |
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|
234831 | if (p->force_delivery) pm->force_delivery = 1; |
| 6099 |
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|
234831 | if (!pm->proposer.msg) return; |
| 6100 |
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|
234831 | assert(pm && pm->proposer.msg); |
| 6101 | 234831 | handle_ack_accept(site, pm, p); | |
| 6102 | 234831 | paxos_fsm(pm, site, paxos_ack_accept, p); | |
| 6103 | } | ||
| 6104 | } | ||
| 6105 | |||
| 6106 | 236870 | static void process_learn_op(site_def const *site, pax_msg *p, | |
| 6107 | linkage *reply_queue) { | ||
| 6108 | 236870 | pax_machine *pm = get_cache(p->synode); | |
| 6109 |
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|
236870 | assert(pm); |
| 6110 | (void)reply_queue; | ||
| 6111 |
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|
236870 | if (p->force_delivery) pm->force_delivery = 1; |
| 6112 | 236870 | update_max_synode(p); | |
| 6113 | 236870 | paxos_fsm(pm, site, paxos_learn, p); | |
| 6114 | 236870 | handle_learn(site, pm, p); | |
| 6115 | 236870 | } | |
| 6116 | |||
| 6117 | 45731 | static void process_recover_learn_op(site_def const *site, pax_msg *p, | |
| 6118 | linkage *reply_queue) { | ||
| 6119 | 45731 | pax_machine *pm = get_cache(p->synode); | |
| 6120 |
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|
45731 | assert(pm); |
| 6121 | (void)reply_queue; | ||
| 6122 | IFDBG(D_NONE, FN; STRLIT("recover_learn_op receive "); SYCEXP(p->synode)); | ||
| 6123 |
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|
45731 | if (p->force_delivery) pm->force_delivery = 1; |
| 6124 | 45731 | update_max_synode(p); | |
| 6125 | { | ||
| 6126 | IFDBG(D_NONE, FN; STRLIT("recover_learn_op learn "); SYCEXP(p->synode)); | ||
| 6127 | 45731 | p->op = learn_op; | |
| 6128 | 45731 | paxos_fsm(pm, site, paxos_learn, p); | |
| 6129 | 45731 | handle_learn(site, pm, p); | |
| 6130 | } | ||
| 6131 | 45731 | } | |
| 6132 | |||
| 6133 | 256248 | static void process_skip_op(site_def const *site, pax_msg *p, | |
| 6134 | linkage *reply_queue) { | ||
| 6135 | (void)reply_queue; | ||
| 6136 | 256248 | pax_machine *pm = get_cache(p->synode); | |
| 6137 |
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|
256248 | assert(pm); |
| 6138 |
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|
256248 | if (p->force_delivery) pm->force_delivery = 1; |
| 6139 | 256248 | paxos_fsm(pm, site, paxos_learn, p); | |
| 6140 | 256248 | handle_skip(site, pm, p); | |
| 6141 | 256248 | } | |
| 6142 | |||
| 6143 | 154336 | static void process_i_am_alive_op(site_def const *site, pax_msg *p, | |
| 6144 | linkage *reply_queue) { | ||
| 6145 | /* Update max_synode, but use only p->max_synode, ignore p->synode */ | ||
| 6146 |
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|
154336 | if (!is_dead_site(p->group_id)) { |
| 6147 |
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|
308405 | if (max_synode.group_id == p->synode.group_id && |
| 6148 |
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|
154069 | synode_gt(p->max_synode, max_synode)) { |
| 6149 | 2321 | set_max_synode(p->max_synode); | |
| 6150 | } | ||
| 6151 | } | ||
| 6152 | 154336 | handle_alive(site, reply_queue, p); | |
| 6153 | 154336 | } | |
| 6154 | |||
| 6155 | 5914 | static void process_are_you_alive_op(site_def const *site, pax_msg *p, | |
| 6156 | linkage *reply_queue) { | ||
| 6157 | 5914 | handle_alive(site, reply_queue, p); | |
| 6158 | 5914 | } | |
| 6159 | |||
| 6160 | ✗ | static void process_need_boot_op(site_def const *site, pax_msg *p, | |
| 6161 | linkage *reply_queue) { | ||
| 6162 | /* purecov: begin deadcode */ | ||
| 6163 | /* Only in run state. Test state and do it here because we need to use | ||
| 6164 | * reply queue */ | ||
| 6165 | ✗ | if (can_send_snapshot() && | |
| 6166 | ✗ | !synode_eq(get_site_def()->boot_key, null_synode)) { | |
| 6167 | ✗ | handle_boot(site, reply_queue, p); | |
| 6168 | } | ||
| 6169 | /* Wake senders waiting to connect, since new node has appeared */ | ||
| 6170 | ✗ | wakeup_sender(); | |
| 6171 | /* purecov: end */ | ||
| 6172 | } | ||
| 6173 | |||
| 6174 | ✗ | static void process_die_op(site_def const *site, pax_msg *p, | |
| 6175 | linkage *reply_queue) { | ||
| 6176 | (void)reply_queue; | ||
| 6177 | /* assert("die horribly" == "need coredump"); */ | ||
| 6178 | { | ||
| 6179 | ✗ | GET_GOUT; | |
| 6180 | ✗ | FN; | |
| 6181 | ✗ | STRLIT("die_op "); | |
| 6182 | ✗ | SYCEXP(executed_msg); | |
| 6183 | ✗ | SYCEXP(delivered_msg); | |
| 6184 | ✗ | SYCEXP(p->synode); | |
| 6185 | ✗ | SYCEXP(p->delivered_msg); | |
| 6186 | ✗ | SYCEXP(p->max_synode); | |
| 6187 | ✗ | PRINT_GOUT; | |
| 6188 | ✗ | FREE_GOUT; | |
| 6189 | } | ||
| 6190 | /* | ||
| 6191 | If the message with the number in the incoming die_op message | ||
| 6192 | already has been executed (delivered), then it means that we | ||
| 6193 | actually got consensus on it, since otherwise we would not have | ||
| 6194 | delivered it.Such a situation could arise if one of the nodes has | ||
| 6195 | expelled the message from its cache, but others have not. So when | ||
| 6196 | sending out a request, we might get two different answers, one | ||
| 6197 | indicating that we are too far behind and should restart, and | ||
| 6198 | another with the actual consensus value. If the value arrives | ||
| 6199 | first, we will deliver it, and then the die_op may arrive later. | ||
| 6200 | But it this case it does not matter, since we got what we needed | ||
| 6201 | anyway. It is only a partial guard against exiting without really | ||
| 6202 | needing it of course, since the die_op may arrive first, and we | ||
| 6203 | do not wait for a die_op from all the other nodes. We could do | ||
| 6204 | that with some extra housekeeping in the pax_machine (a new bit | ||
| 6205 | vector), but I am not convinced that it is worth the effort. | ||
| 6206 | */ | ||
| 6207 | ✗ | if (!synode_lt(p->synode, executed_msg)) { | |
| 6208 | ADD_DBG(D_FSM, add_event(EVENT_DUMP_PAD, string_arg("terminating"));) | ||
| 6209 | ✗ | g_critical("Node %u is unable to get message {%x %" PRIu64 | |
| 6210 | " %u}, since the group is too far " | ||
| 6211 | "ahead. Node will now exit.", | ||
| 6212 | get_nodeno(site), SY_MEM(p->synode)); | ||
| 6213 | ✗ | terminate_and_exit(); | |
| 6214 | } | ||
| 6215 | } | ||
| 6216 | |||
| 6217 | 333399 | static void process_read_op(site_def const *site, pax_msg *p, | |
| 6218 | linkage *reply_queue) { | ||
| 6219 | 333399 | pax_machine *pm = get_cache(p->synode); | |
| 6220 |
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|
333399 | assert(pm); |
| 6221 | |||
| 6222 | 333399 | handle_read(site, pm, reply_queue, p); | |
| 6223 | 333399 | } | |
| 6224 | |||
| 6225 | 1360 | static void process_gcs_snapshot_op(site_def const *site, pax_msg *p, | |
| 6226 | linkage *reply_queue) { | ||
| 6227 | (void)site; | ||
| 6228 | (void)reply_queue; | ||
| 6229 | /* Avoid duplicate snapshots and snapshots from zombies */ | ||
| 6230 | IFDBG(D_BASE, FN; SYCEXP(executed_msg);); | ||
| 6231 | IFDBG(D_BASE, FN; SYCEXP(start_config);); | ||
| 6232 |
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|
2720 | if (!synode_eq(start_config, get_highest_boot_key(p->gcs_snap)) && |
| 6233 | 1360 | !is_dead_site(p->group_id)) { | |
| 6234 | 1360 | update_max_synode(p); | |
| 6235 | /* For incoming messages, note delivery of snapshot from sender node */ | ||
| 6236 | 1360 | note_snapshot(p->from); | |
| 6237 |
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|
1360 | XCOM_FSM(x_fsm_snapshot, void_arg(p->gcs_snap)); |
| 6238 | } | ||
| 6239 | 1360 | } | |
| 6240 | |||
| 6241 | 240065 | static void process_tiny_learn_op(site_def const *site, pax_msg *p, | |
| 6242 | linkage *reply_queue) { | ||
| 6243 |
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240065 | if (p->msg_type == no_op) { |
| 6244 | 24434 | process_learn_op(site, p, reply_queue); | |
| 6245 | } else { | ||
| 6246 | 215631 | pax_machine *pm = get_cache(p->synode); | |
| 6247 |
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|
215631 | assert(pm); |
| 6248 |
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|
215631 | if (p->force_delivery) pm->force_delivery = 1; |
| 6249 | 215631 | handle_tiny_learn(site, pm, p); | |
| 6250 | } | ||
| 6251 | 240065 | } | |
| 6252 | |||
| 6253 | /* If this node is leader, grant a synode number for use by secondary. | ||
| 6254 | Send reply as synode_allocated. */ | ||
| 6255 | 461 | static void process_synode_request(site_def const *site, pax_msg *p, | |
| 6256 | linkage *reply_queue) { | ||
| 6257 | (void)site; | ||
| 6258 | |||
| 6259 | /* Find a free slot */ | ||
| 6260 |
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|
461 | assert(!synode_eq(current_message, null_synode)); |
| 6261 | IFDBG(D_CONS, FN; SYCEXP(executed_msg); SYCEXP(current_message)); | ||
| 6262 | 461 | site_def *tmp_site = find_site_def_rw(current_message); | |
| 6263 | /* See if we can do anything with this message */ | ||
| 6264 |
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|
461 | if (tmp_site && get_nodeno(tmp_site) != VOID_NODE_NO && is_leader(tmp_site)) { |
| 6265 | /* Send reply with msgno */ | ||
| 6266 |
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456 | synode_no msgno = local_synode_allocator(current_message); |
| 6267 | /* Ensure that reply is sane. Note that we only allocate `msgno` *if* next | ||
| 6268 | synod is still within the event horizon. This effectively means that | ||
| 6269 | the leader always reserves at least one synod to himself, the last | ||
| 6270 | synod of the event horizon. The point is to ensure that the leader does | ||
| 6271 | not allocate all the possible synods to a non-leader that then doesn't | ||
| 6272 | act on them, e.g. by crashing. The last synod of the event horizon will | ||
| 6273 | always be up for grabs either by the leader, or if the leader is | ||
| 6274 | suspected, by some non-leader that will self-allocate that synod to | ||
| 6275 | himself. */ | ||
| 6276 |
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|
896 | if (!(too_far(incr_msgno(msgno)) || |
| 6277 |
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|
440 | ignore_message(msgno, find_site_def_rw(msgno), |
| 6278 | "process_synode_request"))) { | ||
| 6279 | // We will grab this number, advance current_message | ||
| 6280 |
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440 | set_current_message(incr_synode(msgno)); |
| 6281 | IFDBG(D_CONS, FN; STRLIT("sending reply "); SYCEXP(executed_msg); | ||
| 6282 | SYCEXP(current_message); SYCEXP(msgno)); | ||
| 6283 |
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|
440 | CREATE_REPLY(p); |
| 6284 | 440 | reply->synode = msgno; | |
| 6285 | 440 | reply->op = synode_allocated; | |
| 6286 | IFDBG(D_CONS, FN; SYCEXP(msgno)); | ||
| 6287 |
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|
440 | SEND_REPLY; |
| 6288 | } else { | ||
| 6289 | IFDBG(D_CONS, FN; STRLIT("not sending reply "); SYCEXP(executed_msg); | ||
| 6290 | SYCEXP(msgno)); | ||
| 6291 | } | ||
| 6292 | } else { | ||
| 6293 | IFDBG(D_CONS, FN; STRLIT("not leader "); | ||
| 6294 | if (tmp_site) SYCEXP(tmp_site->start)); | ||
| 6295 | } | ||
| 6296 | 461 | } | |
| 6297 | |||
| 6298 | /* If this node is secondary, add synode to set of available synodes */ | ||
| 6299 | 456 | static void process_synode_allocated(site_def const *site, pax_msg *p, | |
| 6300 | linkage *reply_queue) { | ||
| 6301 | (void)site; | ||
| 6302 | (void)p; | ||
| 6303 | (void)reply_queue; | ||
| 6304 | |||
| 6305 | IFDBG(D_BASE, FN; SYCEXP(p->synode)); | ||
| 6306 | 456 | synode_number_pool.put(p->synode, synode_allocation_type::remote); | |
| 6307 | 456 | } | |
| 6308 | |||
| 6309 | static msg_handler dispatch_table[LAST_OP] = {process_client_msg, | ||
| 6310 | nullptr, | ||
| 6311 | process_prepare_op, | ||
| 6312 | process_ack_prepare_op, | ||
| 6313 | process_ack_prepare_op, | ||
| 6314 | process_accept_op, | ||
| 6315 | process_ack_accept_op, | ||
| 6316 | process_learn_op, | ||
| 6317 | process_recover_learn_op, | ||
| 6318 | nullptr, | ||
| 6319 | nullptr, | ||
| 6320 | nullptr, | ||
| 6321 | nullptr, | ||
| 6322 | nullptr, | ||
| 6323 | process_skip_op, | ||
| 6324 | process_i_am_alive_op, | ||
| 6325 | process_are_you_alive_op, | ||
| 6326 | process_need_boot_op, | ||
| 6327 | nullptr, | ||
| 6328 | process_die_op, | ||
| 6329 | process_read_op, | ||
| 6330 | process_gcs_snapshot_op, | ||
| 6331 | nullptr, | ||
| 6332 | process_tiny_learn_op, | ||
| 6333 | process_synode_request, | ||
| 6334 | process_synode_allocated}; | ||
| 6335 | |||
| 6336 | 68 | static msg_handler *clone_dispatch_table(msg_handler const *proto) { | |
| 6337 | msg_handler *clone = | ||
| 6338 | 68 | static_cast<msg_handler *>(xcom_calloc(1, sizeof(dispatch_table))); | |
| 6339 |
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68 | if (clone) |
| 6340 | 68 | memcpy(clone, proto, sizeof(dispatch_table)); | |
| 6341 | else | ||
| 6342 | ✗ | oom_abort = 1; | |
| 6343 | 68 | return clone; | |
| 6344 | } | ||
| 6345 | |||
| 6346 | 33 | static msg_handler *primary_dispatch_table() { | |
| 6347 | 33 | msg_handler *clone = clone_dispatch_table(dispatch_table); | |
| 6348 | 33 | return clone; | |
| 6349 | } | ||
| 6350 | |||
| 6351 | 35 | static msg_handler *secondary_dispatch_table() { | |
| 6352 | 35 | msg_handler *clone = clone_dispatch_table(dispatch_table); | |
| 6353 |
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35 | if (clone) { |
| 6354 | 35 | clone[synode_request] = nullptr; | |
| 6355 | } | ||
| 6356 | 35 | return clone; | |
| 6357 | } | ||
| 6358 | |||
| 6359 | 1925392 | pax_msg *dispatch_op(site_def const *site, pax_msg *p, linkage *reply_queue) { | |
| 6360 | 1925392 | site_def *dsite = find_site_def_rw(p->synode); | |
| 6361 | |||
| 6362 |
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|
1925392 | if (dsite && p->op != client_msg && is_server_connected(dsite, p->from)) { |
| 6363 | /* Wake up the detector task if this node was previously marked as | ||
| 6364 | * potentially failed. */ | ||
| 6365 |
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|
1549272 | if (!note_detected(dsite, p->from)) task_wakeup(&detector_wait); |
| 6366 | 1549272 | update_delivered(dsite, p->from, p->delivered_msg); | |
| 6367 | } | ||
| 6368 | |||
| 6369 | IFDBG(D_BASE, FN; STRLIT("incoming message "); | ||
| 6370 | COPY_AND_FREE_GOUT(dbg_pax_msg(p));); | ||
| 6371 | ADD_DBG(D_DISPATCH, add_synode_event(p->synode); | ||
| 6372 | add_event(EVENT_DUMP_PAD, string_arg("p->from")); | ||
| 6373 | add_event(EVENT_DUMP_PAD, uint_arg(p->from)); | ||
| 6374 | add_event(EVENT_DUMP_PAD, string_arg("too_far(p->synode)")); | ||
| 6375 | add_event(EVENT_DUMP_PAD, int_arg(too_far(p->synode))); | ||
| 6376 | add_event(EVENT_DUMP_PAD, string_arg(pax_op_to_str(p->op)));); | ||
| 6377 | |||
| 6378 |
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1925392 | if (p->op >= 0 && p->op < LAST_OP) { |
| 6379 |
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1925392 | if (site && site->dispatch_table) { /* Use site-specific dispatch if any */ |
| 6380 |
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12249 | if (site->dispatch_table[p->op]) |
| 6381 | 12249 | site->dispatch_table[p->op](site, p, reply_queue); | |
| 6382 | } else { | ||
| 6383 |
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1913143 | if (dispatch_table[p->op]) dispatch_table[p->op](site, p, reply_queue); |
| 6384 | } | ||
| 6385 | } else { | ||
| 6386 | ✗ | G_WARNING("No possible handler for message %d %s", p->op, | |
| 6387 | pax_op_to_str(p->op)); | ||
| 6388 | } | ||
| 6389 | |||
| 6390 |
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1925392 | if (oom_abort) { |
| 6391 | ✗ | g_critical("Node %u has run out of memory and will now exit.", | |
| 6392 | get_nodeno(site)); | ||
| 6393 | ✗ | terminate_and_exit(); | |
| 6394 | } | ||
| 6395 | 1925392 | return (p); | |
| 6396 | } | ||
| 6397 | |||
| 6398 | /* Acceptor-learner task */ | ||
| 6399 | #define SERIALIZE_REPLY(msg) \ | ||
| 6400 | msg->to = ep->p->from; \ | ||
| 6401 | msg->from = ep->p->to; \ | ||
| 6402 | msg->delivered_msg = get_delivered_msg(); \ | ||
| 6403 | msg->max_synode = get_max_synode(); \ | ||
| 6404 | serialize_msg(msg, ep->rfd->x_proto, &ep->buflen, &ep->buf); | ||
| 6405 | |||
| 6406 | #define WRITE_REPLY \ | ||
| 6407 | if (ep->buflen) { \ | ||
| 6408 | int64_t sent; \ | ||
| 6409 | IFDBG(D_TRANSPORT, FN; STRLIT("task_write "); NDBG(ep->rfd.fd, d); \ | ||
| 6410 | NDBG(ep->buflen, u)); \ | ||
| 6411 | TASK_CALL(task_write(ep->rfd, ep->buf, ep->buflen, &sent)); \ | ||
| 6412 | send_count[ep->p->op]++; \ | ||
| 6413 | send_bytes[ep->p->op] += ep->buflen; \ | ||
| 6414 | X_FREE(ep->buf); \ | ||
| 6415 | } \ | ||
| 6416 | ep->buf = NULL; | ||
| 6417 | |||
| 6418 | 982222 | static inline void update_srv(server **target, server *srv) { | |
| 6419 |
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|
982222 | if (srv) srv_ref(srv); |
| 6420 |
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|
982222 | if (*target) srv_unref(*target); |
| 6421 | 982222 | *target = srv; | |
| 6422 | 982222 | } | |
| 6423 | |||
| 6424 | /* A message is harmless if it cannot change the outcome of a consensus round. | ||
| 6425 | * learn_op does change the value, but we trust that the sender has correctly | ||
| 6426 | * derived the value from a majority of the acceptors, so in that sense it is | ||
| 6427 | * harmless. */ | ||
| 6428 | 973405 | static int harmless(pax_msg const *p) { | |
| 6429 |
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973405 | if (p->synode.msgno == 0) return 1; |
| 6430 |
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|
971613 | switch (p->op) { |
| 6431 | 343926 | case i_am_alive_op: | |
| 6432 | case are_you_alive_op: | ||
| 6433 | case need_boot_op: | ||
| 6434 | case gcs_snapshot_op: | ||
| 6435 | case learn_op: | ||
| 6436 | case recover_learn_op: | ||
| 6437 | case tiny_learn_op: | ||
| 6438 | case die_op: | ||
| 6439 | 343926 | return 1; | |
| 6440 | 627687 | default: | |
| 6441 | 627687 | return 0; | |
| 6442 | } | ||
| 6443 | } | ||
| 6444 | |||
| 6445 | 1033404 | static int wait_for_cache(pax_machine **pm, synode_no synode, double timeout) { | |
| 6446 | DECL_ENV | ||
| 6447 | double now; | ||
| 6448 | 1033404 | ENV_INIT | |
| 6449 | 1033404 | END_ENV_INIT | |
| 6450 | END_ENV; | ||
| 6451 | |||
| 6452 |
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1033404 | TASK_BEGIN |
| 6453 | 1033404 | ep->now = task_now(); | |
| 6454 |
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1033404 | while ((*pm = get_cache(synode)) == nullptr) { |
| 6455 | /* Wait for executor to make progress */ | ||
| 6456 | ✗ | TIMED_TASK_WAIT(&exec_wait, 0.5); | |
| 6457 | ✗ | if (task_now() - ep->now > timeout) break; /* Timeout, return NULL. */ | |
| 6458 | } | ||
| 6459 | 1033404 | FINALLY | |
| 6460 |
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1033404 | TASK_END; |
| 6461 | } | ||
| 6462 | |||
| 6463 | /* | ||
| 6464 | Verify if we need to poll the cache before calling dispatch_op. | ||
| 6465 | Avoid waiting for a machine if it is not going to be used. | ||
| 6466 | */ | ||
| 6467 | 926654 | static bool_t should_poll_cache(pax_op op) { | |
| 6468 |
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926654 | if (op == die_op || op == gcs_snapshot_op || op == initial_op || |
| 6469 | op == client_msg) | ||
| 6470 | 3152 | return FALSE; | |
| 6471 | 923502 | return TRUE; | |
| 6472 | } | ||
| 6473 | |||
| 6474 | 422720 | int acceptor_learner_task(task_arg arg) { | |
| 6475 | DECL_ENV | ||
| 6476 | connection_descriptor *rfd; | ||
| 6477 | srv_buf *in_buf; | ||
| 6478 | pax_msg *p; | ||
| 6479 | u_int buflen; | ||
| 6480 | char *buf; | ||
| 6481 | linkage reply_queue; | ||
| 6482 | int errors; | ||
| 6483 | server *srv; | ||
| 6484 | site_def const *site; | ||
| 6485 | int behind; | ||
| 6486 | 7752 | ENV_INIT | |
| 6487 | 7752 | END_ENV_INIT | |
| 6488 | END_ENV; | ||
| 6489 | |||
| 6490 | 422720 | int64_t n{0}; | |
| 6491 | 422720 | pax_machine *pm{nullptr}; | |
| 6492 | |||
| 6493 |
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|
422720 | TASK_BEGIN |
| 6494 | |||
| 6495 | 7752 | ep->rfd = (connection_descriptor *)get_void_arg(arg); | |
| 6496 | 7752 | ep->in_buf = (srv_buf *)xcom_calloc(1, sizeof(srv_buf)); | |
| 6497 | 7752 | ep->p = nullptr; | |
| 6498 | 7752 | ep->buflen = 0; | |
| 6499 | 7752 | ep->buf = nullptr; | |
| 6500 | 7752 | ep->errors = 0; | |
| 6501 | 7752 | ep->srv = nullptr; | |
| 6502 | 7752 | ep->behind = FALSE; | |
| 6503 | |||
| 6504 | /* We have a connection, make socket non-blocking and wait for request */ | ||
| 6505 |
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7752 | unblock_fd(ep->rfd->fd); |
| 6506 |
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7752 | set_nodelay(ep->rfd->fd); |
| 6507 |
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7752 | wait_io(stack, ep->rfd->fd, 'r'); |
| 6508 |
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15504 | TASK_YIELD; |
| 6509 | |||
| 6510 | 7752 | set_connected(ep->rfd, CON_FD); | |
| 6511 | 7752 | link_init(&ep->reply_queue, TYPE_HASH("msg_link")); | |
| 6512 | |||
| 6513 | 8828 | again: | |
| 6514 |
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982233 | while (!xcom_shutdown) { |
| 6515 | 982233 | ep->site = nullptr; | |
| 6516 |
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982233 | unchecked_replace_pax_msg(&ep->p, pax_msg_new_0(null_synode)); |
| 6517 | |||
| 6518 |
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982233 | if (use_buffered_read) { |
| 6519 |
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|
1796665 | TASK_CALL(buffered_read_msg(ep->rfd, ep->in_buf, ep->p, ep->srv, &n)); |
| 6520 | } else { | ||
| 6521 | /* purecov: begin deadcode */ | ||
| 6522 | ✗ | TASK_CALL(read_msg(ep->rfd, ep->p, ep->srv, &n)); | |
| 6523 | /* purecov: end */ | ||
| 6524 | } | ||
| 6525 | ADD_DBG(D_NONE, add_synode_event(ep->p->synode); | ||
| 6526 | add_event(EVENT_DUMP_PAD, string_arg("ep->p->from")); | ||
| 6527 | add_event(EVENT_DUMP_PAD, uint_arg(ep->p->from)); | ||
| 6528 | add_event(EVENT_DUMP_PAD, string_arg(pax_op_to_str(ep->p->op)));); | ||
| 6529 | |||
| 6530 |
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|
1692316 | if (ep->srv && !ep->srv->invalid && ((int)ep->p->op != (int)client_msg) && |
| 6531 | 711794 | is_connected(ep->srv->con)) | |
| 6532 |
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657232 | server_detected(ep->srv); |
| 6533 | |||
| 6534 |
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980522 | if (((int)ep->p->op < (int)client_msg || ep->p->op > LAST_OP)) { |
| 6535 | /* invalid operation, ignore message */ | ||
| 6536 | ✗ | delete_pax_msg(ep->p); | |
| 6537 | ✗ | ep->p = nullptr; | |
| 6538 | ✗ | TASK_YIELD; | |
| 6539 | ✗ | continue; | |
| 6540 | } | ||
| 6541 |
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|
980522 | if (n <= 0) { |
| 6542 | 6041 | break; | |
| 6543 | } | ||
| 6544 |
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|
974481 | if (ep->p->op != client_msg) { // Clients have no site |
| 6545 |
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|
972689 | ep->site = find_site_def(ep->p->synode); |
| 6546 | } | ||
| 6547 | |||
| 6548 | /* Handle this connection on a local_server task instead of this | ||
| 6549 | acceptor_learner_task task. */ | ||
| 6550 | /* purecov: begin deadcode */ | ||
| 6551 |
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974481 | if (ep->p->op == client_msg && ep->p->a && |
| 6552 |
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|
1792 | ep->p->a->body.c_t == convert_into_local_server_type) { |
| 6553 | ✗ | if (local_server_is_setup()) { | |
| 6554 | /* Launch local_server task to handle this connection. */ | ||
| 6555 | { | ||
| 6556 | ✗ | connection_descriptor *con = (connection_descriptor *)xcom_malloc( | |
| 6557 | sizeof(connection_descriptor)); | ||
| 6558 | ✗ | *con = *ep->rfd; | |
| 6559 | ✗ | task_new(local_server, void_arg(con), "local_server", | |
| 6560 | XCOM_THREAD_DEBUG); | ||
| 6561 | } | ||
| 6562 | } | ||
| 6563 | /* Reply to client: | ||
| 6564 | - OK if local_server task is setup, or | ||
| 6565 | - FAIL otherwise. */ | ||
| 6566 | { | ||
| 6567 | ✗ | CREATE_REPLY(ep->p); | |
| 6568 | ✗ | reply->op = xcom_client_reply; | |
| 6569 | ✗ | reply->cli_err = local_server_is_setup() ? REQUEST_OK : REQUEST_FAIL; | |
| 6570 | ✗ | SERIALIZE_REPLY(reply); | |
| 6571 | ✗ | replace_pax_msg(&reply, nullptr); | |
| 6572 | } | ||
| 6573 | ✗ | WRITE_REPLY; | |
| 6574 | ✗ | delete_pax_msg(ep->p); | |
| 6575 | ✗ | ep->p = nullptr; | |
| 6576 | ✗ | if (local_server_is_setup()) { | |
| 6577 | /* Relinquish ownership of the connection. It is now onwed by the | ||
| 6578 | launched local_server task. */ | ||
| 6579 | ✗ | reset_connection(ep->rfd); | |
| 6580 | } | ||
| 6581 | /* Terminate this task. */ | ||
| 6582 | ✗ | TERMINATE; | |
| 6583 | } | ||
| 6584 | /* purecov: end */ | ||
| 6585 | |||
| 6586 | /* | ||
| 6587 | Getting a pointer to the server needs to be done after we have | ||
| 6588 | received a message, since without having received a message, we | ||
| 6589 | cannot know who it is from. We could peek at the message and de‐ | ||
| 6590 | serialize the message number and from field, but since the server | ||
| 6591 | does not change, it should be sufficient to cache the server in | ||
| 6592 | the acceptor_learner task. A cleaner solution would have been to | ||
| 6593 | move the timestamps out of the server object, and have a map in‐ | ||
| 6594 | dexed by IP/port or UUID to track the timestamps, since this is | ||
| 6595 | common to both the sender_task, reply_handler_task, and the ac‐ | ||
| 6596 | ceptor_learner_task. | ||
| 6597 | */ | ||
| 6598 |
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|
974481 | update_srv(&ep->srv, get_server(ep->site, ep->p->from)); |
| 6599 | 974481 | ep->p->refcnt = 1; /* Refcnt from other end is void here */ | |
| 6600 | IFDBG(D_NONE, FN; NDBG(ep->rfd.fd, d); NDBG(task_now(), f); | ||
| 6601 | COPY_AND_FREE_GOUT(dbg_pax_msg(ep->p));); | ||
| 6602 | 974481 | receive_count[ep->p->op]++; | |
| 6603 | 974481 | receive_bytes[ep->p->op] += (uint64_t)n + MSG_HDR_SIZE; | |
| 6604 | { | ||
| 6605 |
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|
974481 | if (get_maxnodes(ep->site) > 0) { |
| 6606 | 908451 | ep->behind = ep->p->synode.msgno < delivered_msg.msgno; | |
| 6607 | } | ||
| 6608 | ADD_DBG(D_BASE, add_event(EVENT_DUMP_PAD, string_arg("before dispatch ")); | ||
| 6609 | add_synode_event(ep->p->synode); | ||
| 6610 | add_event(EVENT_DUMP_PAD, string_arg("ep->p->from")); | ||
| 6611 | add_event(EVENT_DUMP_PAD, uint_arg(ep->p->from)); | ||
| 6612 | add_event(EVENT_DUMP_PAD, string_arg(pax_op_to_str(ep->p->op))); | ||
| 6613 | add_event(EVENT_DUMP_PAD, | ||
| 6614 | string_arg(pax_msg_type_to_str(ep->p->msg_type))); | ||
| 6615 | add_event(EVENT_DUMP_PAD, string_arg("is_cached(ep->p->synode)")); | ||
| 6616 | add_event(EVENT_DUMP_PAD, int_arg(is_cached(ep->p->synode))); | ||
| 6617 | add_event(EVENT_DUMP_PAD, string_arg("behind")); | ||
| 6618 | add_event(EVENT_DUMP_PAD, int_arg(ep->behind));); | ||
| 6619 | /* Special treatment to see if synode number is valid. Return no-op if | ||
| 6620 | * not. */ | ||
| 6621 |
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|
974481 | if (ep->p->op == read_op || ep->p->op == prepare_op || |
| 6622 |
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|
612309 | ep->p->op == accept_op) { |
| 6623 |
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|
484571 | if (ep->site) { |
| 6624 | ADD_DBG( | ||
| 6625 | D_BASE, add_event(EVENT_DUMP_PAD, string_arg("ep->p->synode")); | ||
| 6626 | add_synode_event(ep->p->synode); | ||
| 6627 | add_event(EVENT_DUMP_PAD, string_arg("ep->site->start")); | ||
| 6628 | add_synode_event(ep->site->start); add_event( | ||
| 6629 | EVENT_DUMP_PAD, string_arg("ep->site->nodes.node_list_len")); | ||
| 6630 | add_event(EVENT_DUMP_PAD, | ||
| 6631 | uint_arg(ep->site->nodes.node_list_len));); | ||
| 6632 |
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|
448087 | if (ep->p->synode.node >= ep->site->nodes.node_list_len) { |
| 6633 | { | ||
| 6634 |
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1076 | CREATE_REPLY(ep->p); |
| 6635 |
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|
1076 | create_noop(reply); |
| 6636 | 1076 | set_learn_type(reply); | |
| 6637 |
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1076 | SERIALIZE_REPLY(reply); |
| 6638 |
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|
1076 | delete_pax_msg(reply); /* Deallocate BEFORE potentially blocking |
| 6639 | call which will lose value of reply */ | ||
| 6640 | } | ||
| 6641 |
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|
1076 | WRITE_REPLY; |
| 6642 | 1076 | goto again; | |
| 6643 | } | ||
| 6644 | } | ||
| 6645 | } | ||
| 6646 | /* Reject any message that might compromise the integrity of a consensus | ||
| 6647 | * instance. We do this by not processing any message which may change | ||
| 6648 | * the | ||
| 6649 | * outcome if the consensus instance has been evicted from the cache */ | ||
| 6650 | 973405 | if (harmless(ep->p) || /* Harmless message */ | |
| 6651 |
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|
1132093 | is_cached(ep->p->synode) || /* Already in cache */ |
| 6652 |
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|
158688 | (!ep->behind)) { /* Guard against cache pollution from other nodes |
| 6653 | */ | ||
| 6654 | |||
| 6655 |
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|
926654 | if (should_poll_cache(ep->p->op)) { |
| 6656 |
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|
923502 | TASK_CALL(wait_for_cache(&pm, ep->p->synode, 10)); |
| 6657 |
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|
923502 | if (!pm) continue; /* Could not get a machine, discarding message. */ |
| 6658 | } | ||
| 6659 | |||
| 6660 |
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926654 | dispatch_op(ep->site, ep->p, &ep->reply_queue); |
| 6661 | |||
| 6662 | /* Send replies on same fd */ | ||
| 6663 |
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|
1174215 | while (!link_empty(&ep->reply_queue)) { |
| 6664 | { | ||
| 6665 | msg_link *reply = | ||
| 6666 |
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|
247561 | (msg_link *)(link_extract_first(&ep->reply_queue)); |
| 6667 | IFDBG(D_DISPATCH, FN; PTREXP(reply); | ||
| 6668 | COPY_AND_FREE_GOUT(dbg_linkage(&ep->reply_queue)); | ||
| 6669 | COPY_AND_FREE_GOUT(dbg_msg_link(reply)); | ||
| 6670 | COPY_AND_FREE_GOUT(dbg_pax_msg(reply->p));); | ||
| 6671 |
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|
247561 | assert(reply->p); |
| 6672 |
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|
247561 | assert(reply->p->refcnt > 0); |
| 6673 | IFDBG(D_DISPATCH, FN; STRLIT("serialize "); PTREXP(reply)); | ||
| 6674 |
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247561 | SERIALIZE_REPLY(reply->p); |
| 6675 |
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247561 | msg_link_delete(&reply); /* Deallocate BEFORE potentially blocking |
| 6676 | call which will lose value of reply */ | ||
| 6677 | } | ||
| 6678 |
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|
247561 | WRITE_REPLY; |
| 6679 | } | ||
| 6680 | } else { | ||
| 6681 | IFDBG(D_EXEC, FN; STRLIT("rejecting "); | ||
| 6682 | STRLIT(pax_op_to_str(ep->p->op)); NDBG(ep->p->from, d); | ||
| 6683 | NDBG(ep->p->to, d); SYCEXP(ep->p->synode); | ||
| 6684 | BALCEXP(ep->p->proposal)); | ||
| 6685 |
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|
46751 | if (/* xcom_booted() && */ ep->behind) { |
| 6686 |
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46751 | if (/*ep->p->op == prepare_op && */ was_removed_from_cache( |
| 6687 |
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|
46751 | ep->p->synode)) { |
| 6688 | IFDBG(D_NONE, FN; STRLIT("send_die "); | ||
| 6689 | STRLIT(pax_op_to_str(ep->p->op)); NDBG(ep->p->from, d); | ||
| 6690 | NDBG(ep->p->to, d); SYCEXP(ep->p->synode); | ||
| 6691 | BALCEXP(ep->p->proposal)); | ||
| 6692 | ✗ | if (get_maxnodes(ep->site) > 0) { | |
| 6693 | { | ||
| 6694 | ✗ | pax_msg *np = nullptr; | |
| 6695 | ✗ | np = pax_msg_new(ep->p->synode, ep->site); | |
| 6696 | ✗ | np->op = die_op; | |
| 6697 | ✗ | SERIALIZE_REPLY(np); | |
| 6698 | IFDBG(D_NONE, FN; STRLIT("sending die_op to node "); | ||
| 6699 | NDBG(np->to, d); SYCEXP(executed_msg); SYCEXP(max_synode); | ||
| 6700 | SYCEXP(np->synode)); | ||
| 6701 | ✗ | delete_pax_msg(np); /* Deallocate BEFORE potentially blocking | |
| 6702 | call which will lose value of np */ | ||
| 6703 | } | ||
| 6704 | ✗ | WRITE_REPLY; | |
| 6705 | } | ||
| 6706 | } | ||
| 6707 | } | ||
| 6708 | } | ||
| 6709 | } | ||
| 6710 | /* TASK_YIELD; */ | ||
| 6711 | } | ||
| 6712 | |||
| 6713 | ✗ | FINALLY | |
| 6714 | IFDBG(D_BUG, FN; STRLIT(" shutdown "); NDBG(ep->rfd.fd, d); | ||
| 6715 | NDBG(task_now(), f)); | ||
| 6716 |
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|
7741 | if (ep->reply_queue.suc && !link_empty(&ep->reply_queue)) |
| 6717 | ✗ | empty_msg_list(&ep->reply_queue); | |
| 6718 |
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|
7741 | unchecked_replace_pax_msg(&ep->p, nullptr); |
| 6719 |
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|
7741 | shutdown_connection(ep->rfd); |
| 6720 | 7741 | free(ep->rfd); | |
| 6721 | IFDBG(D_NONE, FN; NDBG(xcom_shutdown, d)); | ||
| 6722 |
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|
7741 | if (ep->buf) X_FREE(ep->buf); |
| 6723 | 7741 | free(ep->in_buf); | |
| 6724 | |||
| 6725 | /* Unref srv to avoid leak */ | ||
| 6726 |
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|
7741 | update_srv(&ep->srv, nullptr); |
| 6727 | |||
| 6728 | IFDBG(D_BUG, FN; STRLIT(" shutdown completed"); NDBG(ep->rfd.fd, d); | ||
| 6729 | NDBG(task_now(), f)); | ||
| 6730 |
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|
7741 | TASK_END; |
| 6731 | } | ||
| 6732 | |||
| 6733 | /* Reply handler task */ | ||
| 6734 | |||
| 6735 | static void server_handle_need_snapshot(server *srv, site_def const *s, | ||
| 6736 | node_no node); | ||
| 6737 | |||
| 6738 | 393390 | int reply_handler_task(task_arg arg) { | |
| 6739 | DECL_ENV | ||
| 6740 | server *s; | ||
| 6741 | pax_msg *reply; | ||
| 6742 | double dtime; | ||
| 6743 | 2992 | ENV_INIT | |
| 6744 | 2992 | END_ENV_INIT | |
| 6745 | END_ENV; | ||
| 6746 | |||
| 6747 | 393390 | int64_t n{0}; | |
| 6748 |
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|
393390 | TASK_BEGIN |
| 6749 | |||
| 6750 | 2992 | ep->dtime = INITIAL_CONNECT_WAIT; /* Initial wait is short, to avoid | |
| 6751 | unnecessary waiting */ | ||
| 6752 | 2992 | ep->s = (server *)get_void_arg(arg); | |
| 6753 |
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|
2992 | srv_ref(ep->s); |
| 6754 | 2992 | ep->reply = nullptr; | |
| 6755 | |||
| 6756 |
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|
252115 | while (!xcom_shutdown) { |
| 6757 |
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|
261525 | while (!is_connected(ep->s->con)) { |
| 6758 | IFDBG(D_NONE, FN; STRLIT("waiting for connection")); | ||
| 6759 |
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|
21394 | TASK_DELAY(ep->dtime); |
| 6760 |
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|
9410 | if (xcom_shutdown) { |
| 6761 | ✗ | TERMINATE; | |
| 6762 | } | ||
| 6763 | 9410 | ep->dtime += CONNECT_WAIT_INCREASE; /* Increase wait time for next try */ | |
| 6764 |
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|
9410 | if (ep->dtime > MAX_CONNECT_WAIT) { |
| 6765 | 771 | ep->dtime = MAX_CONNECT_WAIT; | |
| 6766 | } | ||
| 6767 | } | ||
| 6768 | 250828 | ep->dtime = INITIAL_CONNECT_WAIT; | |
| 6769 | { | ||
| 6770 |
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250828 | unchecked_replace_pax_msg(&ep->reply, pax_msg_new_0(null_synode)); |
| 6771 | |||
| 6772 | ADD_DBG(D_NONE, add_event(EVENT_DUMP_PAD, string_arg("ep->s->con.fd")); | ||
| 6773 | add_event(EVENT_DUMP_PAD, int_arg(ep->s->con.fd));); | ||
| 6774 |
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|
515944 | TASK_CALL(read_msg(ep->s->con, ep->reply, ep->s, &n)); |
| 6775 | ADD_DBG(D_NONE, add_event(EVENT_DUMP_PAD, string_arg("ep->s->con.fd")); | ||
| 6776 | add_event(EVENT_DUMP_PAD, int_arg(ep->s->con.fd));); | ||
| 6777 | 249123 | ep->reply->refcnt = 1; /* Refcnt from other end is void here */ | |
| 6778 |
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|
249123 | if (n <= 0) { |
| 6779 |
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|
1980 | shutdown_connection(ep->s->con); |
| 6780 | 1980 | continue; | |
| 6781 | } | ||
| 6782 | 247143 | receive_bytes[ep->reply->op] += (uint64_t)n + MSG_HDR_SIZE; | |
| 6783 | } | ||
| 6784 | IFDBG(D_NONE, FN; NDBG(ep->s->con.fd, d); NDBG(task_now(), f); | ||
| 6785 | COPY_AND_FREE_GOUT(dbg_pax_msg(ep->reply));); | ||
| 6786 | 247143 | receive_count[ep->reply->op]++; | |
| 6787 | |||
| 6788 | ADD_DBG(D_NONE, add_synode_event(ep->reply->synode); | ||
| 6789 | add_event(EVENT_DUMP_PAD, string_arg("ep->reply->from")); | ||
| 6790 | add_event(EVENT_DUMP_PAD, uint_arg(ep->reply->from)); | ||
| 6791 | add_event(EVENT_DUMP_PAD, string_arg(pax_op_to_str(ep->reply->op))); | ||
| 6792 | add_event(EVENT_DUMP_PAD, string_arg("get_site_def()->boot_key")); | ||
| 6793 | add_synode_event(get_site_def()->boot_key);); | ||
| 6794 | /* Special test for need_snapshot, since node and site may not be | ||
| 6795 | * consistent | ||
| 6796 | */ | ||
| 6797 |
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248455 | if (ep->reply->op == need_boot_op && |
| 6798 |
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|
1312 | !synode_eq(get_site_def()->boot_key, null_synode)) { |
| 6799 | 1312 | pax_msg *p = ep->reply; | |
| 6800 | |||
| 6801 | ADD_DBG(D_BASE, | ||
| 6802 | add_event(EVENT_DUMP_PAD, | ||
| 6803 | string_arg("calling server_handle_need_snapshot"));); | ||
| 6804 |
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|
1312 | if (should_handle_need_boot(find_site_def(p->synode), p)) { |
| 6805 |
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|
1312 | server_handle_need_snapshot(ep->s, find_site_def(p->synode), p->from); |
| 6806 | /* Wake senders waiting to connect, since new node has appeared */ | ||
| 6807 |
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|
1312 | wakeup_sender(); |
| 6808 | } else { | ||
| 6809 | ✗ | ep->s->invalid = 1; | |
| 6810 | } | ||
| 6811 | } else { | ||
| 6812 | /* We only handle messages from this connection if the server is valid. | ||
| 6813 | */ | ||
| 6814 |
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245831 | if (ep->s->invalid == 0) |
| 6815 |
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|
245831 | dispatch_op(find_site_def(ep->reply->synode), ep->reply, nullptr); |
| 6816 | } | ||
| 6817 |
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|
494286 | TASK_YIELD; |
| 6818 | } | ||
| 6819 | |||
| 6820 | ✗ | FINALLY | |
| 6821 |
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|
2981 | replace_pax_msg(&ep->reply, nullptr); |
| 6822 | |||
| 6823 |
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|
2981 | shutdown_connection(ep->s->con); |
| 6824 | 2981 | ep->s->reply_handler = nullptr; | |
| 6825 | IFDBG(D_BUG, FN; STRLIT(" shutdown "); NDBG(ep->s->con.fd, d); | ||
| 6826 | NDBG(task_now(), f)); | ||
| 6827 |
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|
2981 | srv_unref(ep->s); |
| 6828 | |||
| 6829 |
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|
2981 | TASK_END; |
| 6830 | } | ||
| 6831 | |||
| 6832 | /* purecov: begin deadcode */ | ||
| 6833 | ✗ | void xcom_sleep(unsigned int seconds) { | |
| 6834 | #if defined(_WIN32) | ||
| 6835 | Sleep((DWORD)seconds * 1000); /* windows sleep takes milliseconds */ | ||
| 6836 | #else | ||
| 6837 | ✗ | sleep(seconds); | |
| 6838 | #endif | ||
| 6839 | } | ||
| 6840 | /* purecov: end */ | ||
| 6841 | |||
| 6842 | /* | ||
| 6843 | * Get a unique long as the basis for XCom group id creation. | ||
| 6844 | * | ||
| 6845 | * NOTE: | ||
| 6846 | * As there is no gethostid() on win, we use seconds since epoch instead, | ||
| 6847 | * so it might fail if you try simultaneous create sites at the same second. | ||
| 6848 | */ | ||
| 6849 | |||
| 6850 | #ifndef _WIN32 | ||
| 6851 | #include <sys/utsname.h> | ||
| 6852 | #endif | ||
| 6853 | |||
| 6854 | 3397 | long xcom_unique_long(void) { | |
| 6855 | #if defined(_WIN32) | ||
| 6856 | __time64_t ltime; | ||
| 6857 | |||
| 6858 | _time64(<ime); | ||
| 6859 | return (long)(ltime ^ GetCurrentProcessId()); | ||
| 6860 | #else | ||
| 6861 | struct utsname buf; | ||
| 6862 | 3397 | uname(&buf); | |
| 6863 | 3397 | long id = (long)fnv_hash((unsigned char *)&buf, sizeof(buf), 0); | |
| 6864 | 3397 | return id ^ getpid(); | |
| 6865 | #endif | ||
| 6866 | } | ||
| 6867 | |||
| 6868 | 5197 | app_data_ptr init_config_with_group(app_data *a, node_list *nl, cargo_type type, | |
| 6869 | uint32_t group_id) { | ||
| 6870 | 5197 | init_app_data(a); | |
| 6871 | 5197 | a->app_key.group_id = a->group_id = group_id; | |
| 6872 | 5197 | a->body.c_t = type; | |
| 6873 | 5197 | init_node_list(nl->node_list_len, nl->node_list_val, &a->body.app_u_u.nodes); | |
| 6874 | 5197 | return a; | |
| 6875 | } | ||
| 6876 | |||
| 6877 | 9 | app_data_ptr init_set_event_horizon_msg(app_data *a, uint32_t group_id, | |
| 6878 | xcom_event_horizon event_horizon) { | ||
| 6879 | 9 | init_app_data(a); | |
| 6880 | 9 | a->app_key.group_id = a->group_id = group_id; | |
| 6881 | 9 | a->body.c_t = set_event_horizon_type; | |
| 6882 | 9 | a->body.app_u_u.event_horizon = event_horizon; | |
| 6883 | 9 | return a; | |
| 6884 | } | ||
| 6885 | |||
| 6886 | 187 | app_data_ptr init_get_msg(app_data *a, uint32_t group_id, cargo_type const t) { | |
| 6887 | 187 | init_app_data(a); | |
| 6888 | 187 | a->app_key.group_id = a->group_id = group_id; | |
| 6889 | 187 | a->body.c_t = t; | |
| 6890 | 187 | return a; | |
| 6891 | } | ||
| 6892 | |||
| 6893 | 85 | app_data_ptr init_get_leaders_msg(app_data *a, uint32_t group_id) { | |
| 6894 | 85 | return init_get_msg(a, group_id, get_leaders_type); | |
| 6895 | } | ||
| 6896 | |||
| 6897 | 99 | app_data_ptr init_get_event_horizon_msg(app_data *a, uint32_t group_id) { | |
| 6898 | 99 | return init_get_msg(a, group_id, get_event_horizon_type); | |
| 6899 | } | ||
| 6900 | |||
| 6901 | 104115 | app_data_ptr init_app_msg(app_data *a, char *payload, u_int payload_size) { | |
| 6902 | 104115 | init_app_data(a); | |
| 6903 | 104115 | a->body.c_t = app_type; | |
| 6904 | 104115 | a->body.app_u_u.data.data_val = payload; /* Takes ownership of payload. */ | |
| 6905 | 104115 | a->body.app_u_u.data.data_len = payload_size; | |
| 6906 | 104115 | return a; | |
| 6907 | } | ||
| 6908 | |||
| 6909 | 3 | static app_data_ptr init_get_synode_app_data_msg( | |
| 6910 | app_data *a, uint32_t group_id, synode_no_array *const synodes) { | ||
| 6911 | 3 | init_get_msg(a, group_id, get_synode_app_data_type); | |
| 6912 | /* Move synodes (as in C++ move semantics) into a->body.app_u_u.synodes. */ | ||
| 6913 | 3 | synode_array_move(&a->body.app_u_u.synodes, synodes); | |
| 6914 | 3 | return a; | |
| 6915 | } | ||
| 6916 | |||
| 6917 | 3 | app_data_ptr init_set_cache_size_msg(app_data *a, uint64_t cache_limit) { | |
| 6918 | 3 | init_app_data(a); | |
| 6919 | 3 | a->body.c_t = set_cache_limit; | |
| 6920 | 3 | a->body.app_u_u.cache_limit = cache_limit; | |
| 6921 | 3 | return a; | |
| 6922 | } | ||
| 6923 | |||
| 6924 | ✗ | app_data_ptr init_convert_into_local_server_msg(app_data *a) { | |
| 6925 | ✗ | init_app_data(a); | |
| 6926 | ✗ | a->body.c_t = convert_into_local_server_type; | |
| 6927 | ✗ | return a; | |
| 6928 | } | ||
| 6929 | |||
| 6930 | 1312 | static void server_send_snapshot(server *srv, site_def const *s, | |
| 6931 | gcs_snapshot *gcs_snap, node_no node) { | ||
| 6932 |
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|
1312 | pax_msg *p = pax_msg_new(gcs_snap->log_start, get_site_def()); |
| 6933 |
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|
1312 | ref_msg(p); |
| 6934 | 1312 | p->op = gcs_snapshot_op; | |
| 6935 | 1312 | p->gcs_snap = gcs_snap; | |
| 6936 |
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|
1312 | send_msg(srv, s->nodeno, node, get_group_id(s), p); |
| 6937 |
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|
1312 | unref_msg(&p); |
| 6938 | 1312 | } | |
| 6939 | |||
| 6940 | 1312 | static void server_push_log(server *srv, synode_no push, node_no node) { | |
| 6941 | 1312 | site_def const *s = get_site_def(); | |
| 6942 |
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|
1312 | if (srv && s) { |
| 6943 |
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|
59047 | while (!synode_gt(push, get_max_synode())) { |
| 6944 |
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|
57735 | if (is_cached(push)) { |
| 6945 | /* Need to clone message here since pax_machine may be re-used while | ||
| 6946 | * message is sent */ | ||
| 6947 | 54672 | pax_machine *p = get_cache_no_touch(push, FALSE); | |
| 6948 |
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|
54672 | if (pm_finished(p)) { |
| 6949 |
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|
44520 | pax_msg *pm = clone_pax_msg(p->learner.msg); |
| 6950 |
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|
44520 | if (pm != nullptr) { |
| 6951 |
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|
44520 | ref_msg(pm); |
| 6952 | 44520 | pm->op = recover_learn_op; | |
| 6953 | IFDBG(D_NONE, FN; PTREXP(srv); PTREXP(s);); | ||
| 6954 |
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44520 | send_msg(srv, s->nodeno, node, get_group_id(s), pm); |
| 6955 |
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|
44520 | unref_msg(&pm); |
| 6956 | } | ||
| 6957 | } | ||
| 6958 | } | ||
| 6959 | 57735 | push = incr_synode(push); | |
| 6960 | } | ||
| 6961 | } | ||
| 6962 | 1312 | } | |
| 6963 | |||
| 6964 | /* purecov: begin deadcode */ | ||
| 6965 | ✗ | static void reply_push_log(synode_no push, linkage *reply_queue) { | |
| 6966 | ✗ | while (!synode_gt(push, get_max_synode())) { | |
| 6967 | ✗ | if (is_cached(push)) { | |
| 6968 | /* Need to clone message here since pax_machine may be re-used while | ||
| 6969 | * message is sent */ | ||
| 6970 | ✗ | pax_machine *p = get_cache_no_touch(push, FALSE); | |
| 6971 | ✗ | if (pm_finished(p)) { | |
| 6972 | ✗ | pax_msg *reply = clone_pax_msg(p->learner.msg); | |
| 6973 | ✗ | ref_msg(reply); | |
| 6974 | ✗ | reply->op = recover_learn_op; | |
| 6975 | { | ||
| 6976 | ✗ | msg_link *msg_x = msg_link_new(reply, reply->from); | |
| 6977 | IFDBG(D_NONE, FN; PTREXP(msg_x)); | ||
| 6978 | ✗ | link_into(&(msg_x->l), reply_queue); | |
| 6979 | } | ||
| 6980 | ✗ | replace_pax_msg(&reply, nullptr); | |
| 6981 | ✗ | unref_msg(&reply); | |
| 6982 | } | ||
| 6983 | } | ||
| 6984 | ✗ | push = incr_synode(push); | |
| 6985 | } | ||
| 6986 | } | ||
| 6987 | /* purecov: end */ | ||
| 6988 | |||
| 6989 | static app_snap_getter get_app_snap_cb; | ||
| 6990 | static app_snap_handler handle_app_snap_cb; | ||
| 6991 | |||
| 6992 | 1312 | static gcs_snapshot *create_snapshot() { | |
| 6993 | 1312 | gcs_snapshot *gs = nullptr; | |
| 6994 |
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|
1312 | if (get_app_snap_cb) { |
| 6995 | /* purecov: begin deadcode */ | ||
| 6996 | ✗ | blob app_snap = {{0, nullptr}}; /* Initialize in case get_app_snap_cb does | |
| 6997 | not assign a value */ | ||
| 6998 | ✗ | synode_no app_lsn = get_app_snap_cb(&app_snap); | |
| 6999 | |||
| 7000 | /* We have a valid callback, abort if it did not return anything */ | ||
| 7001 | ✗ | if (app_snap.data.data_len == 0) { | |
| 7002 | ADD_DBG(D_BASE, | ||
| 7003 | add_event(EVENT_DUMP_PAD, string_arg("no data, return"));); | ||
| 7004 | ✗ | return nullptr; | |
| 7005 | } | ||
| 7006 | ✗ | gs = export_config(); | |
| 7007 | ✗ | if (!gs) return nullptr; | |
| 7008 | ADD_DBG(D_BASE, add_event(EVENT_DUMP_PAD, string_arg("export config ok"));); | ||
| 7009 | ✗ | gs->app_snap = app_snap; | |
| 7010 | IFDBG(D_BUG, FN; SYCEXP(app_lsn); SYCEXP(gs->log_start); | ||
| 7011 | SYCEXP(gs->log_end)); | ||
| 7012 | |||
| 7013 | /* Set starting point of log to match the snapshot */ | ||
| 7014 | /* If we have a valid synode from application snapshot, see if it should | ||
| 7015 | * be used */ | ||
| 7016 | ✗ | if (!synode_eq(null_synode, app_lsn)) { | |
| 7017 | /* If log_start is null_synode, always use valid synode from application | ||
| 7018 | * snapshot */ | ||
| 7019 | ✗ | if (synode_eq(null_synode, gs->log_start) || | |
| 7020 | ✗ | !synode_gt(app_lsn, gs->log_start)) { | |
| 7021 | ✗ | gs->log_start = app_lsn; | |
| 7022 | IFDBG(D_BUG, FN; STRLIT("using "); SYCEXP(app_lsn)); | ||
| 7023 | } | ||
| 7024 | } | ||
| 7025 | ADD_DBG(D_BASE, add_event(EVENT_DUMP_PAD, string_arg("gs->log_start")); | ||
| 7026 | add_synode_event(gs->log_start); | ||
| 7027 | add_event(EVENT_DUMP_PAD, string_arg("gs->log_end")); | ||
| 7028 | add_synode_event(gs->log_end);); | ||
| 7029 | /* purecov: end */ | ||
| 7030 | } else { | ||
| 7031 | 1312 | gs = export_config(); | |
| 7032 |
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|
1312 | if (!gs) return nullptr; |
| 7033 | ADD_DBG(D_BASE, add_event(EVENT_DUMP_PAD, string_arg("export config ok"));); | ||
| 7034 |
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|
1312 | if (!synode_eq(null_synode, last_config_modification_id)) { |
| 7035 | /* No valid valid synode from application snapshot, use | ||
| 7036 | * last_config_modification_id if not null_synode */ | ||
| 7037 | 1312 | gs->log_start = last_config_modification_id; | |
| 7038 | IFDBG(D_BUG, FN; STRLIT("using "); SYCEXP(last_config_modification_id)); | ||
| 7039 | } | ||
| 7040 | IFDBG(D_BUG, FN; SYCEXP(gs->log_start); SYCEXP(gs->log_end)); | ||
| 7041 | ADD_DBG(D_BASE, add_event(EVENT_DUMP_PAD, string_arg("gs->log_start")); | ||
| 7042 | add_synode_event(gs->log_start); | ||
| 7043 | add_event(EVENT_DUMP_PAD, string_arg("gs->log_end")); | ||
| 7044 | add_synode_event(gs->log_end);); | ||
| 7045 | } | ||
| 7046 | IFDBG(D_BUG, FN; SYCEXP(gs->log_start); SYCEXP(gs->log_end)); | ||
| 7047 | 1312 | return gs; | |
| 7048 | } | ||
| 7049 | |||
| 7050 | /* purecov: begin deadcode */ | ||
| 7051 | ✗ | static void handle_need_snapshot(linkage *reply_queue, pax_msg *pm) { | |
| 7052 | ✗ | gcs_snapshot *gs = create_snapshot(); | |
| 7053 | ✗ | if (gs) { | |
| 7054 | ✗ | pax_msg *reply = clone_pax_msg(pm); | |
| 7055 | ✗ | ref_msg(reply); | |
| 7056 | ✗ | reply->op = gcs_snapshot_op; | |
| 7057 | ✗ | reply->gcs_snap = gs; | |
| 7058 | { | ||
| 7059 | ✗ | msg_link *msg_x = msg_link_new(reply, reply->from); | |
| 7060 | IFDBG(D_NONE, FN; PTREXP(msg_x)); | ||
| 7061 | ✗ | link_into(&(msg_x->l), reply_queue); | |
| 7062 | } | ||
| 7063 | ✗ | unref_msg(&reply); | |
| 7064 | IFDBG(D_NONE, FN; STRLIT("sent snapshot");); | ||
| 7065 | ✗ | reply_push_log(gs->log_start, reply_queue); | |
| 7066 | ✗ | send_global_view(); | |
| 7067 | } | ||
| 7068 | } | ||
| 7069 | /* purecov: end */ | ||
| 7070 | |||
| 7071 | static task_env *x_timer = nullptr; | ||
| 7072 | |||
| 7073 | /* Timer for use with the xcom FSM. Will deliver x_fsm_timeout */ | ||
| 7074 | ✗ | static int xcom_timer(task_arg arg) { | |
| 7075 | DECL_ENV | ||
| 7076 | double t; | ||
| 7077 | ✗ | ENV_INIT | |
| 7078 | ✗ | END_ENV_INIT | |
| 7079 | END_ENV; | ||
| 7080 | |||
| 7081 | ✗ | TASK_BEGIN | |
| 7082 | |||
| 7083 | ✗ | ep->t = get_double_arg(arg); | |
| 7084 | ✗ | TASK_DELAY(ep->t); | |
| 7085 | ✗ | XCOM_FSM(x_fsm_timeout, double_arg(ep->t)); | |
| 7086 | ✗ | FINALLY | |
| 7087 | ✗ | if (stack == x_timer) set_task(&x_timer, nullptr); | |
| 7088 | IFDBG(D_CONS, FN; STRLIT(" timeout ")); | ||
| 7089 | ✗ | TASK_END; | |
| 7090 | } | ||
| 7091 | |||
| 7092 | /* Stop the xcom FSM timer */ | ||
| 7093 | 2197 | static void stop_x_timer() { | |
| 7094 |
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|
2197 | if (x_timer) { |
| 7095 | ✗ | task_terminate(x_timer); | |
| 7096 | ✗ | set_task(&x_timer, nullptr); | |
| 7097 | } | ||
| 7098 | 2197 | } | |
| 7099 | |||
| 7100 | /* Start the xcom FSM timer */ | ||
| 7101 | ✗ | static void start_x_timer(double t) { | |
| 7102 | ✗ | stop_x_timer(); | |
| 7103 | ✗ | set_task(&x_timer, task_new(xcom_timer, double_arg(t), "xcom_timer", | |
| 7104 | XCOM_THREAD_DEBUG)); | ||
| 7105 | } | ||
| 7106 | |||
| 7107 | /* Deliver x_fsm_complete to xcom FSM */ | ||
| 7108 | /* purecov: begin deadcode */ | ||
| 7109 | ✗ | static int x_fsm_completion_task(task_arg arg) { | |
| 7110 | DECL_ENV | ||
| 7111 | int dummy; | ||
| 7112 | ✗ | ENV_INIT | |
| 7113 | ✗ | END_ENV_INIT | |
| 7114 | END_ENV; | ||
| 7115 | |||
| 7116 | ✗ | TASK_BEGIN | |
| 7117 | |||
| 7118 | (void) | ||
| 7119 | arg; | ||
| 7120 | ✗ | XCOM_FSM(x_fsm_complete, null_arg); | |
| 7121 | ✗ | FINALLY | |
| 7122 | IFDBG(D_FSM, FN; STRLIT(" delivered ")); | ||
| 7123 | ✗ | TASK_END; | |
| 7124 | } | ||
| 7125 | /* purecov: end */ | ||
| 7126 | |||
| 7127 | /* Send x_fsm_complete to xcom FSM in the context of the xcom thread. The | ||
| 7128 | * calling thread and the xcom thread must be in a rendezvous. Using a task to | ||
| 7129 | * deliver a message is an abstraction inversion, but it's the simplest | ||
| 7130 | * solution until we get a proper queue-based communication system going. */ | ||
| 7131 | /* purecov: begin deadcode */ | ||
| 7132 | ✗ | void send_x_fsm_complete() { | |
| 7133 | ✗ | task_new(x_fsm_completion_task, null_arg, "x_fsm_completion_task", | |
| 7134 | XCOM_THREAD_DEBUG); | ||
| 7135 | } | ||
| 7136 | /* purecov: end */ | ||
| 7137 | |||
| 7138 | 1312 | static void server_handle_need_snapshot(server *srv, site_def const *s, | |
| 7139 | node_no node) { | ||
| 7140 |
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|
1312 | G_INFO("Received an XCom snapshot request from %s:%d", srv->srv, srv->port); |
| 7141 | 1312 | gcs_snapshot *gs = create_snapshot(); | |
| 7142 | |||
| 7143 |
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|
1312 | if (gs) { |
| 7144 | 1312 | server_send_snapshot(srv, s, gs, node); | |
| 7145 | IFDBG(D_NONE, FN; STRLIT("sent snapshot");); | ||
| 7146 |
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|
1312 | G_INFO("XCom snapshot sent to %s:%d", srv->srv, srv->port); |
| 7147 | 1312 | server_push_log(srv, gs->log_start, node); | |
| 7148 | 1312 | send_global_view(); | |
| 7149 | } | ||
| 7150 | 1312 | } | |
| 7151 | |||
| 7152 | #define X(b) #b | ||
| 7153 | const char *xcom_actions_name[] = {x_actions}; | ||
| 7154 | #undef X | ||
| 7155 | |||
| 7156 | static int snapshots[NSERVERS]; | ||
| 7157 | |||
| 7158 | /* Note that we have received snapshot from node */ | ||
| 7159 | 1360 | static void note_snapshot(node_no node) { | |
| 7160 |
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|
1360 | if (node != VOID_NODE_NO) { |
| 7161 | 1360 | snapshots[node] = 1; | |
| 7162 | } | ||
| 7163 | 1360 | } | |
| 7164 | |||
| 7165 | /* Reset set of received snapshots */ | ||
| 7166 | 3397 | static void reset_snapshot_mask() { | |
| 7167 | int i; | ||
| 7168 |
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|
343097 | for (i = 0; i < NSERVERS; i++) { |
| 7169 | 339700 | snapshots[i] = 0; | |
| 7170 | } | ||
| 7171 | 3397 | } | |
| 7172 | |||
| 7173 | /* See if we have got a snapshot from every node */ | ||
| 7174 | ✗ | static int got_all_snapshots() { | |
| 7175 | node_no i; | ||
| 7176 | ✗ | node_no max = get_maxnodes(get_site_def()); | |
| 7177 | ✗ | if (0 == max) { | |
| 7178 | ✗ | return 0; | |
| 7179 | } | ||
| 7180 | ✗ | for (i = 0; i < max; i++) { | |
| 7181 | ✗ | if (!snapshots[i]) { | |
| 7182 | ✗ | return 0; | |
| 7183 | } | ||
| 7184 | } | ||
| 7185 | ✗ | return 1; | |
| 7186 | } | ||
| 7187 | |||
| 7188 | static synode_no log_start_max; /* Initialized by xcom_fsm */ | ||
| 7189 | static synode_no log_end_max; /* Initialized by xcom_fsm */ | ||
| 7190 | |||
| 7191 | /* See if this snapshot is better than what we already have */ | ||
| 7192 | /* purecov: begin deadcode */ | ||
| 7193 | ✗ | static int better_snapshot(gcs_snapshot *gcs) { | |
| 7194 | ✗ | synode_no boot_key = config_max_boot_key(gcs); | |
| 7195 | ✗ | return synode_gt(boot_key, get_site_def()->boot_key) || | |
| 7196 | ✗ | (synode_eq(boot_key, get_site_def()->boot_key) && | |
| 7197 | ✗ | (synode_gt(gcs->log_start, log_start_max) || | |
| 7198 | ✗ | (synode_eq(gcs->log_start, log_start_max) && | |
| 7199 | ✗ | synode_gt(gcs->log_end, log_end_max)))); | |
| 7200 | } | ||
| 7201 | /* purecov: end */ | ||
| 7202 | |||
| 7203 | /* Install snapshot */ | ||
| 7204 | 1360 | static void handle_x_snapshot(gcs_snapshot *gcs) { | |
| 7205 |
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|
1360 | G_INFO( |
| 7206 | "Installing requested snapshot. Importing all incoming configurations."); | ||
| 7207 | 1360 | import_config(gcs); | |
| 7208 |
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|
1360 | if (get_nodeno(get_site_def()) == VOID_NODE_NO) { |
| 7209 | IFDBG(D_BASE, FN; STRLIT("Not member of site, not executing log")); | ||
| 7210 | ✗ | gcs->log_end = | |
| 7211 | gcs->log_start; /* Avoid executing log if not member of site */ | ||
| 7212 | } | ||
| 7213 |
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|
1360 | if (handle_app_snap_cb) |
| 7214 | 1360 | handle_app_snap_cb(&gcs->app_snap, gcs->log_start, gcs->log_end); | |
| 7215 | 1360 | set_max_synode(gcs->log_end); | |
| 7216 | 1360 | set_executed_msg(incr_synode(gcs->log_start)); | |
| 7217 | 1360 | log_start_max = gcs->log_start; | |
| 7218 | 1360 | log_end_max = gcs->log_end; | |
| 7219 | |||
| 7220 | 1360 | set_last_received_config(get_highest_boot_key(gcs)); | |
| 7221 | |||
| 7222 |
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|
1360 | G_INFO("Finished snapshot installation. My node number is %d", |
| 7223 | get_nodeno(get_site_def())); | ||
| 7224 | |||
| 7225 | IFDBG(D_BUG, FN; SYCEXP(gcs->log_start); SYCEXP(gcs->log_end); | ||
| 7226 | SYCEXP(last_config_modification_id); SYCEXP(executed_msg);); | ||
| 7227 | 1360 | } | |
| 7228 | |||
| 7229 | /* Note that we have received snapshot, and install if better than old */ | ||
| 7230 | /* purecov: begin deadcode */ | ||
| 7231 | ✗ | static void update_best_snapshot(gcs_snapshot *gcs) { | |
| 7232 | ✗ | if (get_site_def() == nullptr || better_snapshot(gcs)) { | |
| 7233 | ✗ | handle_x_snapshot(gcs); | |
| 7234 | } | ||
| 7235 | } | ||
| 7236 | /* purecov: end */ | ||
| 7237 | |||
| 7238 | /* Send need_boot_op to all nodes in current config */ | ||
| 7239 | /* purecov: begin deadcode */ | ||
| 7240 | ✗ | static void send_need_boot() { | |
| 7241 | ✗ | pax_msg *p = pax_msg_new_0(null_synode); | |
| 7242 | ✗ | ref_msg(p); | |
| 7243 | ✗ | p->synode = get_site_def()->start; | |
| 7244 | ✗ | p->op = need_boot_op; | |
| 7245 | ✗ | send_to_all_except_self(get_site_def(), p, "need_boot_op"); | |
| 7246 | ✗ | unref_msg(&p); | |
| 7247 | } | ||
| 7248 | /* purecov: end */ | ||
| 7249 | |||
| 7250 | /* Set log_end of snapshot based on log_end in snapshot and max synode */ | ||
| 7251 | 2672 | void set_log_end(gcs_snapshot *gcs) { | |
| 7252 |
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|
2672 | if (synode_gt(get_max_synode(), gcs->log_end)) { |
| 7253 | 1312 | gcs->log_end = get_max_synode(); | |
| 7254 | } | ||
| 7255 | 2672 | } | |
| 7256 | |||
| 7257 | struct xcom_fsm_state; | ||
| 7258 | typedef struct xcom_fsm_state xcom_fsm_state; | ||
| 7259 | |||
| 7260 | /* Function pointer corresponding to a state. Return 1 if execution should | ||
| 7261 | * continue, 0 otherwise */ | ||
| 7262 | typedef int (*xcom_fsm_fp)(xcom_actions action, task_arg fsmargs, | ||
| 7263 | xcom_fsm_state *ctxt); | ||
| 7264 | |||
| 7265 | /* Function pointer and name */ | ||
| 7266 | struct xcom_fsm_state { | ||
| 7267 | xcom_fsm_fp state_fp; | ||
| 7268 | char const *state_name; | ||
| 7269 | }; | ||
| 7270 | |||
| 7271 | #define X_FSM_STATE(s) \ | ||
| 7272 | { s, #s } | ||
| 7273 | #define SET_X_FSM_STATE(s) \ | ||
| 7274 | do { \ | ||
| 7275 | ctxt->state_fp = s; \ | ||
| 7276 | ctxt->state_name = #s; \ | ||
| 7277 | } while (0) | ||
| 7278 | |||
| 7279 | /* The state functions/thunks */ | ||
| 7280 | static int xcom_fsm_init(xcom_actions action, task_arg fsmargs, | ||
| 7281 | xcom_fsm_state *ctxt); | ||
| 7282 | static int xcom_fsm_start_enter(xcom_actions action, task_arg fsmargs, | ||
| 7283 | xcom_fsm_state *ctxt); | ||
| 7284 | static int xcom_fsm_start(xcom_actions action, task_arg fsmargs, | ||
| 7285 | xcom_fsm_state *ctxt); | ||
| 7286 | static int xcom_fsm_snapshot_wait_enter(xcom_actions action, task_arg fsmargs, | ||
| 7287 | xcom_fsm_state *ctxt); | ||
| 7288 | static int xcom_fsm_snapshot_wait(xcom_actions action, task_arg fsmargs, | ||
| 7289 | xcom_fsm_state *ctxt); | ||
| 7290 | static int xcom_fsm_recover_wait_enter(xcom_actions action, task_arg fsmargs, | ||
| 7291 | xcom_fsm_state *ctxt); | ||
| 7292 | static int xcom_fsm_recover_wait(xcom_actions action, task_arg fsmargs, | ||
| 7293 | xcom_fsm_state *ctxt); | ||
| 7294 | static int xcom_fsm_run_enter(xcom_actions action, task_arg fsmargs, | ||
| 7295 | xcom_fsm_state *ctxt); | ||
| 7296 | static int xcom_fsm_run(xcom_actions action, task_arg fsmargs, | ||
| 7297 | xcom_fsm_state *ctxt); | ||
| 7298 | |||
| 7299 | /* You are in a twisting maze of little functions ... */ | ||
| 7300 | |||
| 7301 | /* init state */ | ||
| 7302 | 1207 | static int xcom_fsm_init(xcom_actions action, task_arg fsmargs, | |
| 7303 | xcom_fsm_state *ctxt) { | ||
| 7304 | (void)action; | ||
| 7305 | (void)fsmargs; | ||
| 7306 | IFDBG(D_NONE, FN;); | ||
| 7307 | /* Initialize basic xcom data */ | ||
| 7308 | 1207 | xcom_thread_init(); | |
| 7309 | 1207 | SET_X_FSM_STATE(xcom_fsm_start_enter); | |
| 7310 | 1207 | return 1; | |
| 7311 | } | ||
| 7312 | |||
| 7313 | /* start_enter state */ | ||
| 7314 | 3397 | static int xcom_fsm_start_enter(xcom_actions action, task_arg fsmargs, | |
| 7315 | xcom_fsm_state *ctxt) { | ||
| 7316 | (void)action; | ||
| 7317 | (void)fsmargs; | ||
| 7318 | /* push_dbg(D_DETECT | D_FSM | D_FILEOP | D_CONS | D_BASE | D_TRANSPORT); | ||
| 7319 | */ | ||
| 7320 | 3397 | push_dbg(D_FSM); | |
| 7321 | IFDBG(D_NONE, FN; STRLIT("state x_start");); | ||
| 7322 | 3397 | empty_prop_input_queue(); | |
| 7323 | 3397 | empty_synode_number_pool(); | |
| 7324 | 3397 | reset_snapshot_mask(); | |
| 7325 | 3397 | set_last_received_config(null_synode); | |
| 7326 | |||
| 7327 | 3397 | SET_X_FSM_STATE(xcom_fsm_start); | |
| 7328 | 3397 | return 1; | |
| 7329 | } | ||
| 7330 | |||
| 7331 | 837 | static int handle_fsm_net_boot(task_arg fsmargs, xcom_fsm_state *ctxt, | |
| 7332 | int cont) { | ||
| 7333 | 837 | app_data *a = (app_data *)get_void_arg(fsmargs); | |
| 7334 | 837 | install_node_group(a); | |
| 7335 |
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|
837 | if (is_member(get_site_def())) { |
| 7336 | 837 | empty_prop_input_queue(); | |
| 7337 | 837 | empty_synode_number_pool(); | |
| 7338 | { | ||
| 7339 |
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|
837 | synode_no start = get_site_def()->start; |
| 7340 |
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|
837 | if (start.msgno == 0) { /* May happen during initial boot */ |
| 7341 | 837 | start.msgno = 1; /* Start with first xcom message */ | |
| 7342 | /* If msgno is 0, it means that this node installed a unified_boot | ||
| 7343 | which came from the client, thus this node is the one that will send | ||
| 7344 | the unified_boot on xcom, so set the node number of start accordingly | ||
| 7345 | */ | ||
| 7346 |
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|
837 | start.node = get_nodeno(get_site_def()); |
| 7347 | } | ||
| 7348 |
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|
837 | set_executed_msg(start); |
| 7349 | } | ||
| 7350 | 837 | pop_dbg(); | |
| 7351 | 837 | SET_X_FSM_STATE(xcom_fsm_run_enter); | |
| 7352 | 837 | cont = 1; | |
| 7353 | } | ||
| 7354 | 837 | return cont; | |
| 7355 | } | ||
| 7356 | |||
| 7357 | 1360 | static int handle_fsm_snapshot(task_arg fsmargs, xcom_fsm_state *ctxt) { | |
| 7358 | 1360 | gcs_snapshot *gcs = (gcs_snapshot *)get_void_arg(fsmargs); | |
| 7359 | 1360 | empty_prop_input_queue(); | |
| 7360 | 1360 | empty_synode_number_pool(); | |
| 7361 | 1360 | set_log_end(gcs); | |
| 7362 | 1360 | handle_x_snapshot(gcs); | |
| 7363 | |||
| 7364 | /* Get recovery manager going again */ | ||
| 7365 |
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|
1360 | if (recovery_restart_cb) recovery_restart_cb(); |
| 7366 | |||
| 7367 | /* If we run under control of the recovery manager, we need to call | ||
| 7368 | * recovery_begin_cb to rendezvous with the recovery manager */ | ||
| 7369 |
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|
1360 | if (recovery_begin_cb) recovery_begin_cb(); |
| 7370 | |||
| 7371 | /* If we run under control of the recovery manager, we need to call | ||
| 7372 | * recovery_end_cb to rendezvous with the recovery manager */ | ||
| 7373 |
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|
1360 | if (recovery_end_cb) recovery_end_cb(); |
| 7374 | |||
| 7375 | /* If we are here, it means that we are recovering from another node | ||
| 7376 | */ | ||
| 7377 | /* Do not bother to wait for more snapshots, just handle it and | ||
| 7378 | enter run state */ | ||
| 7379 | 1360 | pop_dbg(); | |
| 7380 | 1360 | SET_X_FSM_STATE(xcom_fsm_run_enter); | |
| 7381 | 1360 | return 1; | |
| 7382 | } | ||
| 7383 | |||
| 7384 | /* purecov: begin deadcode */ | ||
| 7385 | ✗ | static int handle_fsm_snapshot_wait(xcom_fsm_state *ctxt) { | |
| 7386 | ✗ | empty_prop_input_queue(); | |
| 7387 | ✗ | empty_synode_number_pool(); | |
| 7388 | ✗ | start_x_timer(SNAPSHOT_WAIT_TIME); | |
| 7389 | ✗ | pop_dbg(); | |
| 7390 | ✗ | SET_X_FSM_STATE(xcom_fsm_snapshot_wait_enter); | |
| 7391 | ✗ | return 1; | |
| 7392 | } | ||
| 7393 | /* purecov: end */ | ||
| 7394 | |||
| 7395 | 2348 | static void handle_fsm_exit() { | |
| 7396 | /* Xcom is finished when we get here */ | ||
| 7397 | 2348 | push_dbg(D_BUG); | |
| 7398 | 2348 | bury_site(get_group_id(get_site_def())); | |
| 7399 | 2348 | task_terminate_all(); /* Kill, kill, kill, kill, kill, kill. This is | |
| 7400 | the end. */ | ||
| 7401 | |||
| 7402 | /* init_xcom_base(); */ /* Reset shared variables */ | ||
| 7403 | 2348 | init_tasks(); /* Reset task variables */ | |
| 7404 | 2348 | free_site_defs(); | |
| 7405 | 2348 | free_forced_config_site_def(); | |
| 7406 | 2348 | wait_forced_config = 0; | |
| 7407 | 2348 | garbage_collect_servers(); | |
| 7408 | IFDBG(D_NONE, FN; STRLIT("shutting down")); | ||
| 7409 | 2348 | xcom_shutdown = 1; | |
| 7410 | 2348 | start_config = null_synode; | |
| 7411 |
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|
2348 | G_DEBUG("Exiting xcom thread"); |
| 7412 | 2348 | } | |
| 7413 | |||
| 7414 | /* start state */ | ||
| 7415 | 9255 | static int xcom_fsm_start(xcom_actions action, task_arg fsmargs, | |
| 7416 | xcom_fsm_state *ctxt) { | ||
| 7417 | static int need_init_cache = 0; | ||
| 7418 | 9255 | int cont = 0; /* Set to 1 if we should continue execution */ | |
| 7419 | |||
| 7420 |
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|
9255 | switch (action) { |
| 7421 | 2362 | case x_fsm_init: | |
| 7422 | 2362 | xcom_shutdown = 0; | |
| 7423 | 2362 | sent_alive = 0.0; | |
| 7424 | 2362 | oom_abort = 0; | |
| 7425 |
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|
2362 | if (need_init_cache) init_cache(); |
| 7426 | 2362 | break; | |
| 7427 | |||
| 7428 | 837 | case x_fsm_net_boot: | |
| 7429 | 837 | cont = handle_fsm_net_boot(fsmargs, ctxt, cont); | |
| 7430 | 837 | break; | |
| 7431 | |||
| 7432 | 1360 | case x_fsm_snapshot: | |
| 7433 | 1360 | cont = handle_fsm_snapshot(fsmargs, ctxt); | |
| 7434 | 1360 | break; | |
| 7435 | |||
| 7436 | /* This is the entry point for the initial recovery after the process | ||
| 7437 | * has started when running under an external recovery manager. */ | ||
| 7438 | /* If we get x_fsm_snapshot_wait, we are called from the recovery | ||
| 7439 | * manager thread */ | ||
| 7440 | /* purecov: begin deadcode */ | ||
| 7441 | ✗ | case x_fsm_snapshot_wait: | |
| 7442 | ✗ | cont = handle_fsm_snapshot_wait(ctxt); | |
| 7443 | ✗ | break; | |
| 7444 | /* purecov: end */ | ||
| 7445 | |||
| 7446 | 2348 | case x_fsm_exit: | |
| 7447 | 2348 | handle_fsm_exit(); | |
| 7448 | 2348 | break; | |
| 7449 | |||
| 7450 | 2348 | default: | |
| 7451 | 2348 | break; | |
| 7452 | } | ||
| 7453 | 9255 | need_init_cache = 1; | |
| 7454 | 9255 | return cont; | |
| 7455 | } | ||
| 7456 | |||
| 7457 | /* snapshot_wait_enter state */ | ||
| 7458 | /* purecov: begin deadcode */ | ||
| 7459 | ✗ | static int xcom_fsm_snapshot_wait_enter(xcom_actions action, task_arg fsmargs, | |
| 7460 | xcom_fsm_state *ctxt) { | ||
| 7461 | (void)action; | ||
| 7462 | (void)fsmargs; | ||
| 7463 | ✗ | push_dbg(D_DETECT | D_FSM | D_FILEOP | D_CONS | D_BASE | D_TRANSPORT); | |
| 7464 | IFDBG(D_NONE, FN; STRLIT("state x_snapshot_wait");); | ||
| 7465 | ✗ | log_start_max = null_synode; | |
| 7466 | ✗ | log_end_max = null_synode; | |
| 7467 | ✗ | SET_X_FSM_STATE(xcom_fsm_snapshot_wait); | |
| 7468 | ✗ | return 0; | |
| 7469 | } | ||
| 7470 | /* purecov: end */ | ||
| 7471 | |||
| 7472 | /* purecov: begin deadcode */ | ||
| 7473 | ✗ | static int handle_local_snapshot(task_arg fsmargs, xcom_fsm_state *ctxt) { | |
| 7474 | ✗ | update_best_snapshot((gcs_snapshot *)get_void_arg(fsmargs)); | |
| 7475 | /* When recovering locally, fetch node number from site_def after | ||
| 7476 | * processing the snapshot */ | ||
| 7477 | ✗ | note_snapshot(get_site_def()->nodeno); | |
| 7478 | ✗ | send_need_boot(); | |
| 7479 | ✗ | pop_dbg(); | |
| 7480 | ✗ | SET_X_FSM_STATE(xcom_fsm_recover_wait_enter); | |
| 7481 | ✗ | return 1; | |
| 7482 | } | ||
| 7483 | /* purecov: end */ | ||
| 7484 | |||
| 7485 | /* purecov: begin deadcode */ | ||
| 7486 | ✗ | static int handle_snapshot(task_arg fsmargs, xcom_fsm_state *ctxt) { | |
| 7487 | /* Snapshot from another node */ | ||
| 7488 | ✗ | gcs_snapshot *gcs = (gcs_snapshot *)get_void_arg(fsmargs); | |
| 7489 | ✗ | set_log_end(gcs); | |
| 7490 | ✗ | update_best_snapshot(gcs); | |
| 7491 | /* We now have a site, so note that we have processed the local | ||
| 7492 | * snapshot even if we have not seen one, since if we are here, no | ||
| 7493 | * local snapshot will ever arrive. This simplifies the test in | ||
| 7494 | * got_all_snapshots() */ | ||
| 7495 | ✗ | note_snapshot(get_site_def()->nodeno); | |
| 7496 | ✗ | send_need_boot(); | |
| 7497 | ✗ | pop_dbg(); | |
| 7498 | ✗ | SET_X_FSM_STATE(xcom_fsm_recover_wait_enter); | |
| 7499 | ✗ | return 1; | |
| 7500 | } | ||
| 7501 | /* purecov: end */ | ||
| 7502 | |||
| 7503 | /* snapshot_wait state */ | ||
| 7504 | /* purecov: begin deadcode */ | ||
| 7505 | ✗ | static int xcom_fsm_snapshot_wait(xcom_actions action, task_arg fsmargs, | |
| 7506 | xcom_fsm_state *ctxt) { | ||
| 7507 | ✗ | switch (action) { | |
| 7508 | /* If we get x_fsm_local_snapshot, we are called from the recovery | ||
| 7509 | * manager thread */ | ||
| 7510 | ✗ | case x_fsm_local_snapshot: | |
| 7511 | ✗ | return handle_local_snapshot(fsmargs, ctxt); | |
| 7512 | |||
| 7513 | ✗ | case x_fsm_snapshot: | |
| 7514 | ✗ | return handle_snapshot(fsmargs, ctxt); | |
| 7515 | |||
| 7516 | ✗ | case x_fsm_timeout: | |
| 7517 | /* Will time out if no snapshot available */ | ||
| 7518 | /* If we run under control of the recovery manager, we need to call | ||
| 7519 | * recovery_end_cb to rendezvous with the recovery manager */ | ||
| 7520 | ✗ | if (recovery_end_cb) recovery_end_cb(); | |
| 7521 | ✗ | pop_dbg(); | |
| 7522 | ✗ | SET_X_FSM_STATE(xcom_fsm_start_enter); | |
| 7523 | ✗ | return 1; | |
| 7524 | |||
| 7525 | ✗ | default: | |
| 7526 | ✗ | break; | |
| 7527 | } | ||
| 7528 | ✗ | return 0; | |
| 7529 | } | ||
| 7530 | /* purecov: end */ | ||
| 7531 | |||
| 7532 | /* recover_wait_enter state */ | ||
| 7533 | /* purecov: begin deadcode */ | ||
| 7534 | ✗ | static int xcom_fsm_recover_wait_enter(xcom_actions action, task_arg fsmargs, | |
| 7535 | xcom_fsm_state *ctxt) { | ||
| 7536 | (void)action; | ||
| 7537 | (void)fsmargs; | ||
| 7538 | ✗ | push_dbg(D_DETECT | D_FSM | D_FILEOP | D_CONS | D_BASE | D_TRANSPORT); | |
| 7539 | IFDBG(D_NONE, FN; STRLIT("state x_recover_wait");); | ||
| 7540 | ✗ | if (got_all_snapshots()) { | |
| 7541 | /* Need to send message to trigger transition in context of xcom | ||
| 7542 | * thread */ | ||
| 7543 | ✗ | send_x_fsm_complete(); | |
| 7544 | } | ||
| 7545 | ✗ | SET_X_FSM_STATE(xcom_fsm_recover_wait); | |
| 7546 | ✗ | return 0; | |
| 7547 | } | ||
| 7548 | /* purecov: end */ | ||
| 7549 | |||
| 7550 | /* recover_wait state */ | ||
| 7551 | /* purecov: begin deadcode */ | ||
| 7552 | ✗ | static int xcom_fsm_recover_wait(xcom_actions action, task_arg fsmargs, | |
| 7553 | xcom_fsm_state *ctxt) { | ||
| 7554 | ✗ | if (action == x_fsm_snapshot) { | |
| 7555 | ✗ | gcs_snapshot *gcs = (gcs_snapshot *)get_void_arg(fsmargs); | |
| 7556 | ✗ | set_log_end(gcs); | |
| 7557 | ✗ | update_best_snapshot(gcs); | |
| 7558 | ✗ | } else if (action == x_fsm_timeout || action == x_fsm_complete) { | |
| 7559 | /* Wait terminated by timeout or because all nodes have sent a | ||
| 7560 | * snapshot */ | ||
| 7561 | /* If we run under control of the recovery manager, we need to call | ||
| 7562 | * recovery_end_cb to rendezvous with the recovery manager */ | ||
| 7563 | ✗ | if (recovery_end_cb) recovery_end_cb(); | |
| 7564 | ✗ | pop_dbg(); | |
| 7565 | ✗ | SET_X_FSM_STATE(xcom_fsm_run_enter); | |
| 7566 | ✗ | return 1; | |
| 7567 | } | ||
| 7568 | ✗ | if (got_all_snapshots()) { | |
| 7569 | /* Need to send message to trigger transition in context of xcom | ||
| 7570 | * thread */ | ||
| 7571 | ✗ | send_x_fsm_complete(); | |
| 7572 | } | ||
| 7573 | ✗ | return 0; | |
| 7574 | } | ||
| 7575 | /* purecov: end */ | ||
| 7576 | |||
| 7577 | /* run_enter state */ | ||
| 7578 | 2197 | static int xcom_fsm_run_enter(xcom_actions action, task_arg fsmargs, | |
| 7579 | xcom_fsm_state *ctxt) { | ||
| 7580 | (void)action; | ||
| 7581 | (void)fsmargs; | ||
| 7582 | 2197 | start_config = get_site_def()->boot_key; | |
| 7583 | |||
| 7584 | /* Final sanity check of executed_msg */ | ||
| 7585 |
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|
2197 | if (find_site_def(executed_msg) == nullptr) { |
| 7586 | /* No site_def matches executed_msg, set it to site->start */ | ||
| 7587 | ✗ | set_executed_msg(get_site_def()->start); | |
| 7588 | } | ||
| 7589 | |||
| 7590 | IFDBG(D_NONE, FN; STRLIT("state x_run");); | ||
| 7591 | IFDBG(D_BUG, FN; SYCEXP(executed_msg);); | ||
| 7592 | IFDBG(D_BUG, FN; SYCEXP(start_config);); | ||
| 7593 | 2197 | stop_x_timer(); | |
| 7594 |
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|
2197 | if (xcom_run_cb) xcom_run_cb(0); |
| 7595 | 2197 | client_boot_done = 1; | |
| 7596 | 2197 | netboot_ok = 1; | |
| 7597 | 2197 | set_proposer_startpoint(); | |
| 7598 | 2197 | create_proposers(); | |
| 7599 | 2197 | set_task(&executor, task_new(executor_task, null_arg, "executor_task", | |
| 7600 | XCOM_THREAD_DEBUG)); | ||
| 7601 | 2197 | set_task(&sweeper, | |
| 7602 | task_new(sweeper_task, null_arg, "sweeper_task", XCOM_THREAD_DEBUG)); | ||
| 7603 | 2197 | set_task(&detector, task_new(detector_task, null_arg, "detector_task", | |
| 7604 | XCOM_THREAD_DEBUG)); | ||
| 7605 | 2197 | set_task(&alive_t, | |
| 7606 | task_new(alive_task, null_arg, "alive_task", XCOM_THREAD_DEBUG)); | ||
| 7607 | 2197 | set_task(&cache_task, task_new(cache_manager_task, null_arg, | |
| 7608 | "cache_manager_task", XCOM_THREAD_DEBUG)); | ||
| 7609 | |||
| 7610 | 2197 | push_dbg(D_FSM /* | D_EXEC | D_BASE | D_TRANSPORT */); | |
| 7611 | 2197 | SET_X_FSM_STATE(xcom_fsm_run); | |
| 7612 | 2197 | return 1; | |
| 7613 | } | ||
| 7614 | |||
| 7615 | 2190 | static int handle_fsm_terminate(task_arg fsmargs, xcom_fsm_state *ctxt) { | |
| 7616 | 2190 | dump_debug_exec_state(); | |
| 7617 | 2190 | client_boot_done = 0; | |
| 7618 | 2190 | netboot_ok = 0; | |
| 7619 | 2190 | oom_abort = 0; | |
| 7620 | 2190 | terminate_proposers(); | |
| 7621 | 2190 | init_proposers(); | |
| 7622 | 2190 | task_terminate(executor); | |
| 7623 | 2190 | set_task(&executor, nullptr); | |
| 7624 | 2190 | task_terminate(sweeper); | |
| 7625 | 2190 | set_task(&sweeper, nullptr); | |
| 7626 | 2190 | task_terminate(detector); | |
| 7627 | 2190 | set_task(&detector, nullptr); | |
| 7628 | 2190 | task_terminate(alive_t); | |
| 7629 | 2190 | set_task(&alive_t, nullptr); | |
| 7630 | 2190 | task_terminate(cache_task); | |
| 7631 | 2190 | set_task(&cache_task, nullptr); | |
| 7632 | |||
| 7633 | 2190 | init_xcom_base(); /* Reset shared variables */ | |
| 7634 | 2190 | free_site_defs(); | |
| 7635 | 2190 | free_forced_config_site_def(); | |
| 7636 | 2190 | wait_forced_config = 0; | |
| 7637 | 2190 | garbage_collect_servers(); | |
| 7638 |
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|
2190 | if (xcom_terminate_cb) xcom_terminate_cb(get_int_arg(fsmargs)); |
| 7639 | 2190 | pop_dbg(); | |
| 7640 | 2190 | SET_X_FSM_STATE(xcom_fsm_start_enter); | |
| 7641 | 2190 | return 1; | |
| 7642 | } | ||
| 7643 | |||
| 7644 | 27 | static void handle_fsm_force_config(task_arg fsmargs) { | |
| 7645 | 27 | app_data *a = (app_data *)get_void_arg(fsmargs); | |
| 7646 | 27 | site_def *s = create_site_def_with_start(a, executed_msg); | |
| 7647 | |||
| 7648 | 27 | s->boot_key = executed_msg; | |
| 7649 | 27 | invalidate_servers(get_site_def(), s); | |
| 7650 | 27 | start_force_config(s, 1); | |
| 7651 | 27 | wait_forced_config = 1; /* Note that forced config has not yet arrived */ | |
| 7652 | 27 | } | |
| 7653 | |||
| 7654 | /* run state */ | ||
| 7655 | 5251 | static int xcom_fsm_run(xcom_actions action, task_arg fsmargs, | |
| 7656 | xcom_fsm_state *ctxt) { | ||
| 7657 |
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|
5251 | switch (action) { |
| 7658 | 2190 | case x_fsm_terminate: | |
| 7659 | 2190 | return handle_fsm_terminate(fsmargs, ctxt); | |
| 7660 | |||
| 7661 | /* purecov: begin deadcode */ | ||
| 7662 | ✗ | case x_fsm_need_snapshot: | |
| 7663 | IFDBG(D_NONE, STRLIT("got snapshot request in x_run state")); | ||
| 7664 | ✗ | break; | |
| 7665 | /* purecov: end */ | ||
| 7666 | |||
| 7667 | 27 | case x_fsm_force_config: | |
| 7668 | 27 | handle_fsm_force_config(fsmargs); | |
| 7669 | 27 | break; | |
| 7670 | |||
| 7671 | 3034 | default: | |
| 7672 | 3034 | break; | |
| 7673 | } | ||
| 7674 | 3061 | return 0; | |
| 7675 | } | ||
| 7676 | |||
| 7677 | /* Trampoline which loops calling thunks pointed to by ctxt.state_fp until 0 | ||
| 7678 | * is returned. Return pointer to ctxt. */ | ||
| 7679 | 10119 | xcom_fsm_state *xcom_fsm_impl(xcom_actions action, task_arg fsmargs) { | |
| 7680 | static xcom_fsm_state ctxt = X_FSM_STATE(xcom_fsm_init); | ||
| 7681 | |||
| 7682 |
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|
10119 | G_DEBUG("%f pid %d xcom_id %x state %s action %s", seconds(), xpid(), |
| 7683 | get_my_xcom_id(), ctxt.state_name, xcom_actions_name[action]); | ||
| 7684 | ADD_DBG(D_FSM, add_event(EVENT_DUMP_PAD, string_arg("state")); | ||
| 7685 | add_event(EVENT_DUMP_PAD, string_arg(ctxt.state_name)); | ||
| 7686 | add_event(EVENT_DUMP_PAD, string_arg("action")); | ||
| 7687 | add_event(EVENT_DUMP_PAD, string_arg(xcom_actions_name[action])); | ||
| 7688 | add_event(EVENT_DUMP_PAD, string_arg("executed_msg")); | ||
| 7689 | add_synode_event(executed_msg);); | ||
| 7690 | #ifdef TASK_EVENT_TRACE | ||
| 7691 | dump_task_events(); | ||
| 7692 | #endif | ||
| 7693 | /* Crank the state machine until it stops */ | ||
| 7694 | IFDBG(D_BUG, FN; STREXP(ctxt.state_name); STREXP(xcom_actions_name[action])); | ||
| 7695 |
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|
21307 | while (ctxt.state_fp(action, fsmargs, &ctxt)) { |
| 7696 | IFDBG(D_BUG, FN; STREXP(ctxt.state_name); | ||
| 7697 | STREXP(xcom_actions_name[action])); | ||
| 7698 | } | ||
| 7699 | 10119 | return &ctxt; | |
| 7700 | } | ||
| 7701 | |||
| 7702 | /* Call FSM trampoline and return state name of resulting state */ | ||
| 7703 | 10119 | char const *xcom_fsm(xcom_actions action, task_arg fsmargs) { | |
| 7704 | 10119 | xcom_fsm_state *s = xcom_fsm_impl(action, fsmargs); | |
| 7705 | 10119 | return s->state_name; | |
| 7706 | } | ||
| 7707 | |||
| 7708 | /* See if we can send a snapshot to another node */ | ||
| 7709 | /* purecov: begin deadcode */ | ||
| 7710 | ✗ | static int can_send_snapshot() { | |
| 7711 | ✗ | xcom_fsm_state *state = xcom_fsm_impl(x_fsm_need_snapshot, null_arg); | |
| 7712 | ✗ | return state->state_fp == xcom_fsm_run; | |
| 7713 | } | ||
| 7714 | /* purecov: end */ | ||
| 7715 | |||
| 7716 | 2302 | void set_app_snap_handler(app_snap_handler x) { handle_app_snap_cb = x; } | |
| 7717 | |||
| 7718 | /* purecov: begin deadcode */ | ||
| 7719 | ✗ | void set_app_snap_getter(app_snap_getter x) { get_app_snap_cb = x; } | |
| 7720 | /* purecov: end */ | ||
| 7721 | |||
| 7722 | /* Read max n bytes from socket fd into buffer buf */ | ||
| 7723 | 5717 | static result socket_read(connection_descriptor *rfd, void *buf, int n) { | |
| 7724 | 5717 | result ret = {0, 0}; | |
| 7725 | |||
| 7726 |
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|
5717 | assert(n >= 0); |
| 7727 | |||
| 7728 | do { | ||
| 7729 |
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|
20703 | ret = con_read(rfd, buf, n); |
| 7730 | 20703 | task_dump_err(ret.funerr); | |
| 7731 |
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|
20703 | } while (ret.val < 0 && can_retry_read(ret.funerr)); |
| 7732 | 5717 | return ret; | |
| 7733 | } | ||
| 7734 | |||
| 7735 | /* Read exactly n bytes from socket fd into buffer buf */ | ||
| 7736 | 5717 | static int64_t socket_read_bytes(connection_descriptor *rfd, char *p, | |
| 7737 | uint32_t n) { | ||
| 7738 | 5717 | uint32_t left = n; | |
| 7739 | 5717 | char *bytes = p; | |
| 7740 | |||
| 7741 | 5717 | result nread = {0, 0}; | |
| 7742 | |||
| 7743 |
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|
11234 | while (left > 0) { |
| 7744 | /* | ||
| 7745 | socket_read just reads no more than INT_MAX bytes. We should not pass | ||
| 7746 | a length more than INT_MAX to it. | ||
| 7747 | */ | ||
| 7748 | 5717 | int r = (int)MIN(left, INT_MAX); | |
| 7749 | |||
| 7750 |
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|
5717 | nread = socket_read(rfd, bytes, r); |
| 7751 |
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|
5717 | if (nread.val == 0) { |
| 7752 | 200 | return 0; | |
| 7753 |
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|
5517 | } else if (nread.val < 0) { |
| 7754 | ✗ | return -1; | |
| 7755 | } else { | ||
| 7756 | 5517 | bytes += nread.val; | |
| 7757 | 5517 | left -= (uint32_t)nread.val; | |
| 7758 | } | ||
| 7759 | } | ||
| 7760 |
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|
5517 | assert(left == 0); |
| 7761 | 5517 | return n; | |
| 7762 | } | ||
| 7763 | |||
| 7764 | /* Write n bytes from buffer buf to socket fd */ | ||
| 7765 | 111339 | static int64_t socket_write(connection_descriptor *wfd, void *_buf, uint32_t n, | |
| 7766 | connnection_write_method write_function) { | ||
| 7767 | 111339 | char *buf = (char *)_buf; | |
| 7768 | 111339 | result ret = {0, 0}; | |
| 7769 | |||
| 7770 | uint32_t total; /* Keeps track of number of bytes written so far */ | ||
| 7771 | |||
| 7772 | 111339 | total = 0; | |
| 7773 |
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|
221576 | while (total < n) { |
| 7774 | 111340 | int w = (int)MIN(n - total, INT_MAX); | |
| 7775 | |||
| 7776 |
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|
112442 | while ((ret = write_function(wfd, buf + total, w)).val < 0 && |
| 7777 | 1102 | can_retry_write(ret.funerr)) { | |
| 7778 | ✗ | task_dump_err(ret.funerr); | |
| 7779 | IFDBG(D_NONE, FN; STRLIT("retry "); NEXP(total, d); NEXP(n, d)); | ||
| 7780 | } | ||
| 7781 |
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|
111339 | if (ret.val <= 0) { /* Something went wrong */ |
| 7782 | 1102 | task_dump_err(ret.funerr); | |
| 7783 | 1102 | return -1; | |
| 7784 | } else { | ||
| 7785 | 110237 | total += (uint32_t)ret.val; /* Add number of bytes written to total */ | |
| 7786 | } | ||
| 7787 | } | ||
| 7788 | IFDBG(D_TRANSPORT, FN; NEXP(total, u); NEXP(n, u)); | ||
| 7789 |
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|
110236 | assert(total == n); |
| 7790 | 110236 | return (total); | |
| 7791 | } | ||
| 7792 | |||
| 7793 | #define CONNECT_FAIL \ | ||
| 7794 | ret_fd = -1; \ | ||
| 7795 | goto end | ||
| 7796 | |||
| 7797 | ✗ | connection_descriptor *xcom_open_client_connection(char const *server, | |
| 7798 | xcom_port port) { | ||
| 7799 | ✗ | return open_new_connection(server, port); | |
| 7800 | } | ||
| 7801 | |||
| 7802 | /* Send a protocol negotiation message on connection con */ | ||
| 7803 | 2039 | static int xcom_send_proto(connection_descriptor *con, xcom_proto x_proto, | |
| 7804 | x_msg_type x_type, unsigned int tag) { | ||
| 7805 | char buf[MSG_HDR_SIZE]; | ||
| 7806 | 2039 | memset(buf, 0, MSG_HDR_SIZE); | |
| 7807 | |||
| 7808 |
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|
2039 | if (con->fd >= 0) { |
| 7809 | 2039 | con->snd_tag = tag; | |
| 7810 |
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|
2039 | write_protoversion(VERS_PTR((unsigned char *)buf), x_proto); |
| 7811 |
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|
2039 | put_header_1_0((unsigned char *)buf, 0, x_type, tag); |
| 7812 | { | ||
| 7813 | int sent; | ||
| 7814 |
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|
2039 | sent = (int)socket_write(con, buf, MSG_HDR_SIZE); |
| 7815 |
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|
2039 | if (con->fd < 0) { |
| 7816 | ✗ | return -1; | |
| 7817 | } | ||
| 7818 | 2039 | return sent; | |
| 7819 | } | ||
| 7820 | } else { | ||
| 7821 | ✗ | return -1; | |
| 7822 | } | ||
| 7823 | } | ||
| 7824 | |||
| 7825 | 2039 | static int xcom_recv_proto(connection_descriptor *rfd, xcom_proto *x_proto, | |
| 7826 | x_msg_type *x_type, unsigned int *tag) { | ||
| 7827 | int n; | ||
| 7828 | unsigned char header_buf[MSG_HDR_SIZE]; | ||
| 7829 | uint32_t msgsize; | ||
| 7830 | |||
| 7831 | /* Read length field, protocol version, and checksum */ | ||
| 7832 |
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|
2039 | n = (int)socket_read_bytes(rfd, (char *)header_buf, MSG_HDR_SIZE); |
| 7833 | |||
| 7834 |
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|
2039 | if (n != MSG_HDR_SIZE) { |
| 7835 | IFDBG(D_NONE, FN; NDBG(n, d)); | ||
| 7836 | 200 | return -1; | |
| 7837 | } | ||
| 7838 | |||
| 7839 |
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|
1839 | *x_proto = read_protoversion(VERS_PTR(header_buf)); |
| 7840 |
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|
1839 | get_header_1_0(header_buf, &msgsize, x_type, tag); |
| 7841 | |||
| 7842 | 1839 | return n; | |
| 7843 | } | ||
| 7844 | |||
| 7845 | enum { TAG_START = 313 }; | ||
| 7846 | |||
| 7847 | /** | ||
| 7848 | * @brief Checks if a given app_data is from a given cargo_type. | ||
| 7849 | * | ||
| 7850 | * @param a the app_data | ||
| 7851 | * @param t the cargo type | ||
| 7852 | * @return int TRUE (1) if app_data a is from cargo_type t | ||
| 7853 | */ | ||
| 7854 | |||
| 7855 | 1851 | static inline int is_cargo_type(app_data_ptr a, cargo_type t) { | |
| 7856 |
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|
1851 | return a ? (a->body.c_t == t) : 0; |
| 7857 | } | ||
| 7858 | |||
| 7859 | /** | ||
| 7860 | * @brief Retrieves the address that was used in the add_node request | ||
| 7861 | * | ||
| 7862 | * @param a app data containing the node to add | ||
| 7863 | * @param member address we used to present ourselves to other nodes | ||
| 7864 | * @return char* a pointer to the address being added. | ||
| 7865 | */ | ||
| 7866 | 12 | static char *get_add_node_address(app_data_ptr a, unsigned int *member) { | |
| 7867 | 12 | char *retval = nullptr; | |
| 7868 |
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|
12 | if (!is_cargo_type(a, add_node_type)) return nullptr; |
| 7869 | |||
| 7870 |
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|
12 | if ((*member) < a->body.app_u_u.nodes.node_list_len) { |
| 7871 | 9 | retval = a->body.app_u_u.nodes.node_list_val[(*member)].address; | |
| 7872 | 9 | (*member)++; | |
| 7873 | } | ||
| 7874 | |||
| 7875 | 12 | return retval; | |
| 7876 | } | ||
| 7877 | |||
| 7878 | 10756 | int is_node_v4_reachable_with_info(struct addrinfo *retrieved_addr_info) { | |
| 7879 | 10756 | int v4_reachable = 0; | |
| 7880 | |||
| 7881 | /* Verify if we are reachable either by V4 and by V6 with the provided | ||
| 7882 | address. */ | ||
| 7883 | 10756 | struct addrinfo *my_own_information_loop = nullptr; | |
| 7884 | |||
| 7885 | 10756 | my_own_information_loop = retrieved_addr_info; | |
| 7886 |
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|
21512 | while (!v4_reachable && my_own_information_loop) { |
| 7887 |
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|
10756 | if (my_own_information_loop->ai_family == AF_INET) { |
| 7888 | 10749 | v4_reachable = 1; | |
| 7889 | } | ||
| 7890 | 10756 | my_own_information_loop = my_own_information_loop->ai_next; | |
| 7891 | } | ||
| 7892 | |||
| 7893 | 10756 | return v4_reachable; | |
| 7894 | } | ||
| 7895 | |||
| 7896 | 6 | int is_node_v4_reachable(char *node_address) { | |
| 7897 | 6 | int v4_reachable = 0; | |
| 7898 | |||
| 7899 | /* Verify if we are reachable either by V4 and by V6 with the provided | ||
| 7900 | address. */ | ||
| 7901 | 6 | struct addrinfo *my_own_information = nullptr; | |
| 7902 | |||
| 7903 |
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|
6 | checked_getaddrinfo(node_address, nullptr, nullptr, &my_own_information); |
| 7904 |
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|
6 | if (my_own_information == nullptr) { |
| 7905 | ✗ | return v4_reachable; | |
| 7906 | } | ||
| 7907 | |||
| 7908 |
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|
6 | v4_reachable = is_node_v4_reachable_with_info(my_own_information); |
| 7909 | |||
| 7910 |
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|
6 | if (my_own_information) freeaddrinfo(my_own_information); |
| 7911 | |||
| 7912 | 6 | return v4_reachable; | |
| 7913 | } | ||
| 7914 | |||
| 7915 | 9 | int are_we_allowed_to_upgrade_to_v6(app_data_ptr a) { | |
| 7916 | /* This should the address we used to present ourselves to other nodes. */ | ||
| 7917 | 9 | unsigned int list_member = 0; | |
| 7918 | 9 | char *added_node = nullptr; | |
| 7919 | |||
| 7920 | 9 | int is_v4_reachable = 0; | |
| 7921 |
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✓ Branch 1 taken 3 times.
|
12 | while ((added_node = get_add_node_address(a, &list_member)) != nullptr) { |
| 7922 | xcom_port my_own_port; | ||
| 7923 | char my_own_address[IP_MAX_SIZE]; | ||
| 7924 | int ip_and_port_error = | ||
| 7925 |
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|
9 | get_ip_and_port(added_node, my_own_address, &my_own_port); |
| 7926 | |||
| 7927 |
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|
9 | if (ip_and_port_error) { |
| 7928 |
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|
3 | G_DEBUG("Error retrieving IP and Port information"); |
| 7929 | 6 | return 0; | |
| 7930 | } | ||
| 7931 | |||
| 7932 | /* Verify if we are reachable either by V4 and by V6 with the provided | ||
| 7933 | address. | ||
| 7934 | This means that the other side won't be able to contact us since we | ||
| 7935 | do not provide a public V4 address */ | ||
| 7936 |
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|
6 | if (!(is_v4_reachable = is_node_v4_reachable(my_own_address))) { |
| 7937 |
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|
3 | G_ERROR( |
| 7938 | "Unable to add node to a group of older nodes. Please " | ||
| 7939 | "reconfigure " | ||
| 7940 | "you local address to an IPv4 address or configure your DNS to " | ||
| 7941 | "provide " | ||
| 7942 | "an IPv4 address"); | ||
| 7943 | 3 | return 0; | |
| 7944 | } | ||
| 7945 | } | ||
| 7946 | |||
| 7947 | 3 | return is_v4_reachable; | |
| 7948 | } | ||
| 7949 | |||
| 7950 | 2042 | int64_t xcom_send_client_app_data(connection_descriptor *fd, app_data_ptr a, | |
| 7951 | int force) { | ||
| 7952 |
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|
2042 | pax_msg *msg = pax_msg_new(null_synode, nullptr); |
| 7953 | 2042 | uint32_t buflen = 0; | |
| 7954 | 2042 | char *buf = nullptr; | |
| 7955 | 2042 | int64_t retval = 0; | |
| 7956 | 2042 | int serialized = 0; | |
| 7957 | |||
| 7958 |
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|
2042 | if (!proto_done(fd)) { |
| 7959 | xcom_proto x_proto; | ||
| 7960 | x_msg_type x_type; | ||
| 7961 | unsigned int tag; | ||
| 7962 |
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|
2039 | retval = xcom_send_proto(fd, my_xcom_version, x_version_req, TAG_START); |
| 7963 |
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|
2039 | G_DEBUG("client sent negotiation request for protocol %d", my_xcom_version); |
| 7964 |
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|
2239 | if (retval < 0) goto end; |
| 7965 |
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|
2039 | retval = xcom_recv_proto(fd, &x_proto, &x_type, &tag); |
| 7966 |
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|
2039 | if (retval < 0) goto end; |
| 7967 |
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|
1839 | if (tag != TAG_START) { |
| 7968 | ✗ | retval = -1; | |
| 7969 | ✗ | goto end; | |
| 7970 | } | ||
| 7971 |
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✓ Branch 1 taken 1839 times.
|
1839 | if (x_type != x_version_reply) { |
| 7972 | ✗ | retval = -1; | |
| 7973 | ✗ | goto end; | |
| 7974 | } | ||
| 7975 | |||
| 7976 |
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|
1839 | if (x_proto == x_unknown_proto) { |
| 7977 | ✗ | G_DEBUG("no common protocol, returning error"); | |
| 7978 | ✗ | retval = -1; | |
| 7979 | ✗ | goto end; | |
| 7980 | } | ||
| 7981 | |||
| 7982 | /* This code will check if, in case of an upgrade if: | ||
| 7983 | - We are a node able to speak IPv6. | ||
| 7984 | - If we are connecting to a group that does not speak IPv6. | ||
| 7985 | - If our address is IPv4-compatible in order for the old group to be | ||
| 7986 | able to contact us back. */ | ||
| 7987 |
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|
1839 | if (is_cargo_type(a, add_node_type) && x_proto < minimum_ipv6_version() && |
| 7988 | ✗ | !are_we_allowed_to_upgrade_to_v6(a)) { | |
| 7989 | ✗ | retval = -1; | |
| 7990 | ✗ | goto end; | |
| 7991 | } | ||
| 7992 | |||
| 7993 |
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|
1839 | G_DEBUG("client connection will use protocol version %d", x_proto); |
| 7994 | IFDBG(D_NONE, STRLIT("client connection will use protocol version "); | ||
| 7995 | NDBG(x_proto, u); STRLIT(xcom_proto_to_str(x_proto))); | ||
| 7996 | 1839 | fd->x_proto = x_proto; | |
| 7997 | 1839 | set_connected(fd, CON_PROTO); | |
| 7998 | } | ||
| 7999 | 1842 | msg->a = a; | |
| 8000 | 1842 | msg->to = VOID_NODE_NO; | |
| 8001 | 1842 | msg->op = client_msg; | |
| 8002 | 1842 | msg->force_delivery = force; | |
| 8003 | |||
| 8004 |
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|
1842 | serialized = serialize_msg(msg, fd->x_proto, &buflen, &buf); |
| 8005 |
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|
1842 | if (serialized) { |
| 8006 |
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|
1839 | retval = socket_write(fd, buf, buflen); |
| 8007 | 1839 | if (buflen != retval) { | |
| 8008 | IFDBG(D_NONE, FN; STRLIT("write failed "); NDBG(fd->fd, d); | ||
| 8009 | NDBG(buflen, d); NDBG64(retval)); | ||
| 8010 | } | ||
| 8011 | } else { | ||
| 8012 | /* Failed to serialize, set retval accordingly. */ | ||
| 8013 | 3 | retval = -1; | |
| 8014 | } | ||
| 8015 | 1842 | X_FREE(buf); | |
| 8016 | 2042 | end: | |
| 8017 | 2042 | msg->a = nullptr; /* Do not deallocate a */ | |
| 8018 |
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|
2042 | XCOM_XDR_FREE(xdr_pax_msg, msg); |
| 8019 | 2042 | return retval; | |
| 8020 | } | ||
| 8021 | |||
| 8022 | /* purecov: begin tested */ | ||
| 8023 | /* | ||
| 8024 | * Tested by TEST_F(XComMultinodeSmokeTest, | ||
| 8025 | * 3_nodes_member_crashes_with_dieop_and_joins_again_immediately) GCS smoke | ||
| 8026 | * test | ||
| 8027 | */ | ||
| 8028 | ✗ | int64_t xcom_client_send_die(connection_descriptor *fd) { | |
| 8029 | ✗ | if (!fd) return 0; | |
| 8030 | ✗ | uint32_t buflen = 0; | |
| 8031 | ✗ | char *buf = nullptr; | |
| 8032 | ✗ | int64_t retval = 0; | |
| 8033 | app_data a; | ||
| 8034 | ✗ | pax_msg *msg = pax_msg_new(null_synode, nullptr); | |
| 8035 | |||
| 8036 | ✗ | if (!proto_done(fd)) { | |
| 8037 | xcom_proto x_proto; | ||
| 8038 | x_msg_type x_type; | ||
| 8039 | unsigned int tag; | ||
| 8040 | ✗ | retval = xcom_send_proto(fd, my_xcom_version, x_version_req, TAG_START); | |
| 8041 | ✗ | G_DEBUG("client sent negotiation request for protocol %d", my_xcom_version); | |
| 8042 | ✗ | if (retval < 0) goto end; | |
| 8043 | ✗ | retval = xcom_recv_proto(fd, &x_proto, &x_type, &tag); | |
| 8044 | ✗ | if (retval < 0) goto end; | |
| 8045 | ✗ | if (tag != TAG_START) { | |
| 8046 | ✗ | retval = -1; | |
| 8047 | ✗ | goto end; | |
| 8048 | } | ||
| 8049 | ✗ | if (x_type != x_version_reply) { | |
| 8050 | ✗ | retval = -1; | |
| 8051 | ✗ | goto end; | |
| 8052 | } | ||
| 8053 | |||
| 8054 | ✗ | if (x_proto == x_unknown_proto) { | |
| 8055 | ✗ | G_DEBUG("no common protocol, returning error"); | |
| 8056 | ✗ | retval = -1; | |
| 8057 | ✗ | goto end; | |
| 8058 | } | ||
| 8059 | ✗ | G_DEBUG("client connection will use protocol version %d", x_proto); | |
| 8060 | IFDBG(D_NONE, STRLIT("client connection will use protocol version "); | ||
| 8061 | NDBG(x_proto, u); STRLIT(xcom_proto_to_str(x_proto))); | ||
| 8062 | ✗ | fd->x_proto = x_proto; | |
| 8063 | ✗ | set_connected(fd, CON_PROTO); | |
| 8064 | } | ||
| 8065 | ✗ | init_app_data(&a); | |
| 8066 | ✗ | a.body.c_t = app_type; | |
| 8067 | ✗ | msg->a = &a; | |
| 8068 | ✗ | msg->op = die_op; | |
| 8069 | /* | ||
| 8070 | Set the msgno to a value that ensures the die_op will be processed by | ||
| 8071 | XCom when it is received (it needs to be higher than the msgno of the | ||
| 8072 | executed_msg, otherwise XCom will simply ignore it). | ||
| 8073 | */ | ||
| 8074 | ✗ | msg->synode.msgno = UINT64_MAX; | |
| 8075 | |||
| 8076 | ✗ | serialize_msg(msg, fd->x_proto, &buflen, &buf); | |
| 8077 | ✗ | if (buflen) { | |
| 8078 | ✗ | retval = socket_write(fd, buf, buflen); | |
| 8079 | ✗ | if (buflen != retval) { | |
| 8080 | IFDBG(D_NONE, FN; STRLIT("write failed "); NDBG(fd->fd, d); | ||
| 8081 | NDBG(buflen, d); NDBG64(retval)); | ||
| 8082 | } | ||
| 8083 | ✗ | X_FREE(buf); | |
| 8084 | } | ||
| 8085 | ✗ | xdr_free((xdrproc_t)xdr_app_data, (char *)&a); | |
| 8086 | ✗ | end: | |
| 8087 | ✗ | msg->a = nullptr; | |
| 8088 | ✗ | XCOM_XDR_FREE(xdr_pax_msg, msg); | |
| 8089 | ✗ | return retval > 0 && retval == buflen ? 1 : 0; | |
| 8090 | } | ||
| 8091 | /* purecov: end */ | ||
| 8092 | |||
| 8093 | #ifdef XCOM_STANDALONE | ||
| 8094 | /* purecov: begin deadcode */ | ||
| 8095 | int64_t xcom_client_send_data(uint32_t size, char *data, | ||
| 8096 | connection_descriptor *fd) { | ||
| 8097 | if (!fd) return 0; | ||
| 8098 | app_data a; | ||
| 8099 | int64_t retval = 0; | ||
| 8100 | init_app_data(&a); | ||
| 8101 | a.body.c_t = app_type; | ||
| 8102 | a.body.app_u_u.data.data_len = size; | ||
| 8103 | a.body.app_u_u.data.data_val = data; | ||
| 8104 | retval = xcom_send_client_app_data(fd, &a, 0); | ||
| 8105 | xdr_free((xdrproc_t)xdr_app_data, (char *)&a); | ||
| 8106 | return retval; | ||
| 8107 | } | ||
| 8108 | |||
| 8109 | int64_t xcom_client_send_data_no_free(uint32_t size, char *data, | ||
| 8110 | connection_descriptor *fd) { | ||
| 8111 | if (!fd) return 0; | ||
| 8112 | app_data a; | ||
| 8113 | int64_t retval = 0; | ||
| 8114 | init_app_data(&a); | ||
| 8115 | a.body.c_t = app_type; | ||
| 8116 | a.body.app_u_u.data.data_len = size; | ||
| 8117 | a.body.app_u_u.data.data_val = data; | ||
| 8118 | retval = xcom_send_client_app_data(fd, &a, 0); | ||
| 8119 | return retval; | ||
| 8120 | } | ||
| 8121 | /* purecov: end */ | ||
| 8122 | #endif | ||
| 8123 | |||
| 8124 | #ifndef _WIN32 | ||
| 8125 | #include <arpa/inet.h> | ||
| 8126 | #include <netinet/in.h> | ||
| 8127 | #include <sys/socket.h> | ||
| 8128 | #endif | ||
| 8129 | |||
| 8130 | /* Output warning in log periodically if we receive messages | ||
| 8131 | with a protocol version that does not match our own */ | ||
| 8132 | /* purecov: begin inspected */ | ||
| 8133 | ✗ | void warn_protoversion_mismatch(connection_descriptor *rfd) { | |
| 8134 | struct sockaddr_storage sock_addr; | ||
| 8135 | ✗ | socklen_t sock_size = sizeof(sock_addr); | |
| 8136 | |||
| 8137 | ✗ | if (task_now() - protoversion_warning_time > PROTOVERSION_WARNING_TIMEOUT) { | |
| 8138 | ✗ | if (0 == | |
| 8139 | ✗ | xcom_getpeername(rfd->fd, (struct sockaddr *)&sock_addr, &sock_size)) { | |
| 8140 | char buf[INET6_ADDRSTRLEN + 1]; | ||
| 8141 | ✗ | struct sockaddr_in *s4 = (struct sockaddr_in *)&sock_addr; | |
| 8142 | ✗ | struct sockaddr_in6 *s6 = (struct sockaddr_in6 *)&sock_addr; | |
| 8143 | char const *ok; | ||
| 8144 | |||
| 8145 | ✗ | memset((void *)buf, 0, sizeof(buf)); | |
| 8146 | ✗ | if (sock_addr.ss_family == AF_INET) { | |
| 8147 | ✗ | ok = inet_ntop(sock_addr.ss_family, (void *)&s4->sin_addr, buf, | |
| 8148 | sizeof(buf)); | ||
| 8149 | } else { | ||
| 8150 | ✗ | ok = inet_ntop(sock_addr.ss_family, (void *)&s6->sin6_addr, buf, | |
| 8151 | sizeof(buf)); | ||
| 8152 | } | ||
| 8153 | ✗ | if (ok) { | |
| 8154 | ✗ | G_WARNING( | |
| 8155 | "Detected incorrect xcom protocol version in connection from %s " | ||
| 8156 | "indicates missing cleanup of, or incorrect, xcom group " | ||
| 8157 | "definition on remote host. Please upgrade the process running on " | ||
| 8158 | "%s to a compatible version or stop it.", | ||
| 8159 | buf, buf); | ||
| 8160 | ✗ | protoversion_warning_time = task_now(); | |
| 8161 | } | ||
| 8162 | } | ||
| 8163 | } | ||
| 8164 | } | ||
| 8165 | /* purecov: end */ | ||
| 8166 | |||
| 8167 | 1839 | static pax_msg *socket_read_msg(connection_descriptor *rfd, pax_msg *p) | |
| 8168 | /* Should buffer reads as well */ | ||
| 8169 | { | ||
| 8170 | int64_t n; | ||
| 8171 | char *bytes; | ||
| 8172 | unsigned char header_buf[MSG_HDR_SIZE]; | ||
| 8173 | xcom_proto x_version; | ||
| 8174 | uint32_t msgsize; | ||
| 8175 | x_msg_type x_type; | ||
| 8176 | unsigned int tag; | ||
| 8177 | 1839 | int deserialize_ok = 0; | |
| 8178 | |||
| 8179 | 1839 | bytes = nullptr; | |
| 8180 | |||
| 8181 | /* Read version, length, type, and tag */ | ||
| 8182 |
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|
1839 | n = socket_read_bytes(rfd, (char *)header_buf, MSG_HDR_SIZE); |
| 8183 | |||
| 8184 |
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✓ Branch 1 taken 1839 times.
|
1839 | if (n <= 0) { |
| 8185 | IFDBG(D_NONE, FN; NDBG64(n)); | ||
| 8186 | ✗ | return nullptr; | |
| 8187 | } | ||
| 8188 |
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|
1839 | assert(n == MSG_HDR_SIZE); |
| 8189 | 1839 | x_version = (xcom_proto)get_32(VERS_PTR(header_buf)); | |
| 8190 | /* Check the protocol version before doing anything else */ | ||
| 8191 | #ifdef XCOM_PARANOID | ||
| 8192 | assert(check_protoversion(x_version, rfd->x_proto)); | ||
| 8193 | #endif | ||
| 8194 |
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|
1839 | if (!check_protoversion(x_version, rfd->x_proto)) { |
| 8195 | /* purecov: begin inspected */ | ||
| 8196 | ✗ | warn_protoversion_mismatch(rfd); | |
| 8197 | ✗ | return nullptr; | |
| 8198 | /* purecov: end */ | ||
| 8199 | } | ||
| 8200 | |||
| 8201 | /* OK, we can grok this version */ | ||
| 8202 | |||
| 8203 |
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|
1839 | get_header_1_0(header_buf, &msgsize, &x_type, &tag); |
| 8204 | |||
| 8205 | /* Allocate buffer space for message */ | ||
| 8206 | 1839 | bytes = (char *)xcom_calloc(1, msgsize); | |
| 8207 | |||
| 8208 | /* Read message */ | ||
| 8209 |
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|
1839 | n = socket_read_bytes(rfd, bytes, msgsize); |
| 8210 | |||
| 8211 |
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|
1839 | if (n > 0) { |
| 8212 | /* Deserialize message */ | ||
| 8213 |
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|
1839 | deserialize_ok = deserialize_msg(p, rfd->x_proto, bytes, msgsize); |
| 8214 | IFDBG(D_NONE, FN; STRLIT(" deserialized message")); | ||
| 8215 | } | ||
| 8216 | /* Deallocate buffer */ | ||
| 8217 | 1839 | X_FREE(bytes); | |
| 8218 |
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|
1839 | if (n <= 0 || deserialize_ok == 0) { |
| 8219 | IFDBG(D_NONE, FN; NDBG64(n)); | ||
| 8220 | ✗ | return nullptr; | |
| 8221 | } | ||
| 8222 | 1839 | return (p); | |
| 8223 | } | ||
| 8224 | |||
| 8225 | #ifdef XCOM_STANDALONE | ||
| 8226 | /* purecov: begin deadcode */ | ||
| 8227 | int xcom_client_boot(connection_descriptor *fd, node_list *nl, | ||
| 8228 | uint32_t group_id) { | ||
| 8229 | if (!fd) return 0; | ||
| 8230 | app_data a; | ||
| 8231 | int retval = 0; | ||
| 8232 | retval = (int)xcom_send_client_app_data( | ||
| 8233 | fd, init_config_with_group(&a, nl, unified_boot_type, group_id), 0); | ||
| 8234 | xdr_free((xdrproc_t)xdr_app_data, (char *)&a); | ||
| 8235 | return retval; | ||
| 8236 | } | ||
| 8237 | /* purecov: end */ | ||
| 8238 | #endif | ||
| 8239 | |||
| 8240 | enum xcom_send_app_wait_result { | ||
| 8241 | SEND_REQUEST_FAILED = 0, | ||
| 8242 | RECEIVE_REQUEST_FAILED, | ||
| 8243 | REQUEST_BOTCHED, | ||
| 8244 | RETRIES_EXCEEDED, | ||
| 8245 | REQUEST_OK_RECEIVED, | ||
| 8246 | REQUEST_FAIL_RECEIVED, | ||
| 8247 | REQUEST_OK_REDIRECT | ||
| 8248 | }; | ||
| 8249 | typedef enum xcom_send_app_wait_result xcom_send_app_wait_result; | ||
| 8250 | |||
| 8251 | /** | ||
| 8252 | * Send a message and wait for response. | ||
| 8253 | * | ||
| 8254 | * The caller is reponsible for freeing p after calling this function, | ||
| 8255 | * i.e. xdr_free((xdrproc_t)xdr_pax_msg, (char *)p) | ||
| 8256 | */ | ||
| 8257 | 2042 | static xcom_send_app_wait_result xcom_send_app_wait_and_get( | |
| 8258 | connection_descriptor *fd, app_data *a, int force, pax_msg *p, | ||
| 8259 | leader_info_data *leaders) { | ||
| 8260 | 2042 | int retval = 0; | |
| 8261 | 2042 | int retry_count = 10; /* Same as 'connection_attempts' */ | |
| 8262 | 2042 | pax_msg *rp = nullptr; | |
| 8263 | |||
| 8264 | do { | ||
| 8265 | 2042 | retval = (int)xcom_send_client_app_data(fd, a, force); | |
| 8266 | 2042 | memset(p, 0, sizeof(*p)); /* before return so caller can free p */ | |
| 8267 |
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✓ Branch 1 taken 1839 times.
|
2042 | if (retval < 0) { |
| 8268 | 203 | return SEND_REQUEST_FAILED; | |
| 8269 | } | ||
| 8270 | 1839 | rp = socket_read_msg(fd, p); | |
| 8271 |
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|
1839 | if (rp) { |
| 8272 | 1839 | client_reply_code cli_err = rp->cli_err; | |
| 8273 |
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|
1839 | switch (cli_err) { |
| 8274 | 1360 | case REQUEST_OK: | |
| 8275 | 1360 | return REQUEST_OK_RECEIVED; | |
| 8276 | 479 | case REQUEST_FAIL: | |
| 8277 |
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|
479 | G_INFO( |
| 8278 | "Sending a request to a remote XCom failed. Please check the " | ||
| 8279 | "remote node log for more details.") | ||
| 8280 | 479 | return REQUEST_FAIL_RECEIVED; | |
| 8281 | ✗ | case REQUEST_RETRY: | |
| 8282 | ✗ | if (retry_count > 1) xdr_free((xdrproc_t)xdr_pax_msg, (char *)p); | |
| 8283 | ✗ | G_INFO( | |
| 8284 | "Retrying a request to a remote XCom. Please check the remote " | ||
| 8285 | "node log for more details.") | ||
| 8286 | ✗ | xcom_sleep(1); | |
| 8287 | ✗ | break; | |
| 8288 | ✗ | case REQUEST_REDIRECT: | |
| 8289 | ✗ | G_DEBUG("cli_err %d", cli_err); | |
| 8290 | ✗ | if (leaders && rp->rd && rp->rd->rt == leader_info) { | |
| 8291 | ✗ | *leaders = steal_leader_info_data(rp->rd->reply_data_u.leaders); | |
| 8292 | } | ||
| 8293 | ✗ | xdr_free((xdrproc_t)xdr_pax_msg, (char *)p); | |
| 8294 | ✗ | return REQUEST_OK_REDIRECT; | |
| 8295 | ✗ | default: | |
| 8296 | ✗ | G_WARNING("XCom client connection has received an unknown response."); | |
| 8297 | ✗ | return REQUEST_BOTCHED; | |
| 8298 | } | ||
| 8299 | } else { | ||
| 8300 | ✗ | G_WARNING("Reading a request from a remote XCom failed."); | |
| 8301 | ✗ | return RECEIVE_REQUEST_FAILED; | |
| 8302 | } | ||
| 8303 | ✗ | } while (--retry_count); | |
| 8304 | /* Timeout after REQUEST_RETRY has been received 'retry_count' times */ | ||
| 8305 | ✗ | G_MESSAGE( | |
| 8306 | "Request failed: maximum number of retries (10) has been exhausted."); | ||
| 8307 | ✗ | return RETRIES_EXCEEDED; | |
| 8308 | } | ||
| 8309 | |||
| 8310 | 2039 | static int xcom_send_app_wait(connection_descriptor *fd, app_data *a, int force, | |
| 8311 | leader_info_data *leaders) { | ||
| 8312 | pax_msg p; | ||
| 8313 | 2039 | int result = 0; | |
| 8314 | 2039 | memset(&p, 0, sizeof(p)); | |
| 8315 | xcom_send_app_wait_result res = | ||
| 8316 |
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|
2039 | xcom_send_app_wait_and_get(fd, a, force, &p, leaders); |
| 8317 |
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|
2039 | switch (res) { |
| 8318 | 679 | case SEND_REQUEST_FAILED: | |
| 8319 | case RECEIVE_REQUEST_FAILED: | ||
| 8320 | case REQUEST_BOTCHED: | ||
| 8321 | case RETRIES_EXCEEDED: | ||
| 8322 | case REQUEST_FAIL_RECEIVED: | ||
| 8323 | case REQUEST_OK_REDIRECT: | ||
| 8324 | 679 | result = 0; | |
| 8325 | 679 | break; | |
| 8326 | 1360 | case REQUEST_OK_RECEIVED: | |
| 8327 | 1360 | result = 1; | |
| 8328 | 1360 | break; | |
| 8329 | } | ||
| 8330 |
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|
2039 | xdr_free((xdrproc_t)xdr_pax_msg, (char *)&p); |
| 8331 | 2039 | return result; | |
| 8332 | } | ||
| 8333 | |||
| 8334 | 2039 | int xcom_send_cfg_wait(connection_descriptor *fd, node_list *nl, | |
| 8335 | uint32_t group_id, cargo_type ct, int force) { | ||
| 8336 | app_data a; | ||
| 8337 | 2039 | int retval = 0; | |
| 8338 | IFDBG(D_NONE, FN; COPY_AND_FREE_GOUT(dbg_list(nl));); | ||
| 8339 |
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|
2039 | retval = xcom_send_app_wait(fd, init_config_with_group(&a, nl, ct, group_id), |
| 8340 | force, nullptr); | ||
| 8341 |
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|
2039 | xdr_free((xdrproc_t)xdr_app_data, (char *)&a); |
| 8342 | 2039 | return retval; | |
| 8343 | } | ||
| 8344 | |||
| 8345 | 2012 | int xcom_client_add_node(connection_descriptor *fd, node_list *nl, | |
| 8346 | uint32_t group_id) { | ||
| 8347 |
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|
2012 | if (!fd) return 0; |
| 8348 | u_int i; | ||
| 8349 |
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|
4024 | for (i = 0; i < nl->node_list_len; i++) { |
| 8350 |
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|
2012 | assert(nl->node_list_val[i].proto.max_proto > x_unknown_proto); |
| 8351 | } | ||
| 8352 | 2012 | return xcom_send_cfg_wait(fd, nl, group_id, add_node_type, 0); | |
| 8353 | } | ||
| 8354 | |||
| 8355 | 27 | int xcom_client_remove_node(connection_descriptor *fd, node_list *nl, | |
| 8356 | uint32_t group_id) { | ||
| 8357 |
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|
27 | if (!fd) return 0; |
| 8358 | 27 | return xcom_send_cfg_wait(fd, nl, group_id, remove_node_type, 0); | |
| 8359 | } | ||
| 8360 | |||
| 8361 | ✗ | static int xcom_check_reply(int const res) { | |
| 8362 | ✗ | return res == REQUEST_OK_RECEIVED; | |
| 8363 | } | ||
| 8364 | |||
| 8365 | #if 0 | ||
| 8366 | /* purecov: begin deadcode */ | ||
| 8367 | int xcom_client_get_event_horizon(connection_descriptor *fd, uint32_t group_id, | ||
| 8368 | xcom_event_horizon *event_horizon) { | ||
| 8369 | if (!fd) return 0; | ||
| 8370 | pax_msg p; | ||
| 8371 | app_data a; | ||
| 8372 | int result = 0; | ||
| 8373 | |||
| 8374 | memset(&p, 0, sizeof(p)); | ||
| 8375 | |||
| 8376 | xcom_send_app_wait_result res = xcom_send_app_wait_and_get( | ||
| 8377 | fd, init_get_event_horizon_msg(&a, group_id), 0, &p, 0); | ||
| 8378 | result = xcom_check_reply(res); | ||
| 8379 | if (result) { | ||
| 8380 | *event_horizon = p.event_horizon; | ||
| 8381 | } | ||
| 8382 | |||
| 8383 | xdr_free((xdrproc_t)xdr_pax_msg, (char *)&p); | ||
| 8384 | xdr_free((xdrproc_t)xdr_app_data, (char *)&a); | ||
| 8385 | |||
| 8386 | return result; | ||
| 8387 | } | ||
| 8388 | /* purecov: end */ | ||
| 8389 | |||
| 8390 | /* purecov: begin deadcode */ | ||
| 8391 | int xcom_client_set_event_horizon(connection_descriptor *fd, uint32_t group_id, | ||
| 8392 | xcom_event_horizon event_horizon) { | ||
| 8393 | if (!fd) return 0; | ||
| 8394 | app_data a; | ||
| 8395 | int retval = 0; | ||
| 8396 | retval = xcom_send_app_wait( | ||
| 8397 | fd, init_set_event_horizon_msg(&a, group_id, event_horizon), 0, 0); | ||
| 8398 | xdr_free((xdrproc_t)xdr_app_data, (char *)&a); | ||
| 8399 | return retval; | ||
| 8400 | } | ||
| 8401 | /* purecov: end */ | ||
| 8402 | #endif | ||
| 8403 | |||
| 8404 | 3 | int xcom_client_get_synode_app_data(connection_descriptor *const fd, | |
| 8405 | uint32_t group_id, | ||
| 8406 | synode_no_array *const synodes, | ||
| 8407 | synode_app_data_array *const reply) { | ||
| 8408 |
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|
3 | if (!fd) return 0; |
| 8409 | 3 | bool_t const success = TRUE; | |
| 8410 | 3 | bool_t const failure = FALSE; | |
| 8411 | 3 | bool_t result = failure; | |
| 8412 | pax_msg p; | ||
| 8413 | app_data a; | ||
| 8414 | 3 | u_int const nr_synodes_requested = synodes->synode_no_array_len; | |
| 8415 | |||
| 8416 | /* This call moves, as in C++ move semantics, synodes into app_data a. */ | ||
| 8417 |
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|
3 | init_get_synode_app_data_msg(&a, group_id, synodes); |
| 8418 | |||
| 8419 | { | ||
| 8420 | xcom_send_app_wait_result res = | ||
| 8421 |
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|
3 | xcom_send_app_wait_and_get(fd, &a, 0, &p, nullptr); |
| 8422 |
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|
3 | switch (res) { |
| 8423 | 3 | case RECEIVE_REQUEST_FAILED: | |
| 8424 | case REQUEST_BOTCHED: | ||
| 8425 | case RETRIES_EXCEEDED: | ||
| 8426 | case SEND_REQUEST_FAILED: | ||
| 8427 | case REQUEST_FAIL_RECEIVED: | ||
| 8428 | case REQUEST_OK_REDIRECT: { | ||
| 8429 |
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|
3 | G_TRACE( |
| 8430 | "xcom_client_get_synode_app_data: XCom did not have the required " | ||
| 8431 | "%u " | ||
| 8432 | "synodes.", | ||
| 8433 | nr_synodes_requested); | ||
| 8434 | 3 | break; | |
| 8435 | } | ||
| 8436 | ✗ | case REQUEST_OK_RECEIVED: { | |
| 8437 | ✗ | u_int const nr_synodes_received = | |
| 8438 | p.requested_synode_app_data.synode_app_data_array_len; | ||
| 8439 | ✗ | G_TRACE( | |
| 8440 | "xcom_client_get_synode_app_data: Got %u synode payloads, we " | ||
| 8441 | "asked " | ||
| 8442 | "for %u.", | ||
| 8443 | nr_synodes_received, nr_synodes_requested); | ||
| 8444 | |||
| 8445 | /* This should always be TRUE. | ||
| 8446 | * But rather than asserting it, let's treat an unexpected number of | ||
| 8447 | * synode payloads in the reply as a failure. */ | ||
| 8448 | ✗ | if (nr_synodes_received == nr_synodes_requested) { | |
| 8449 | /* Move (as in C++ move semantics) into reply */ | ||
| 8450 | ✗ | synode_app_data_array_move(reply, &p.requested_synode_app_data); | |
| 8451 | ✗ | result = success; | |
| 8452 | } | ||
| 8453 | ✗ | break; | |
| 8454 | } | ||
| 8455 | } | ||
| 8456 | } | ||
| 8457 | |||
| 8458 |
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|
3 | xdr_free((xdrproc_t)xdr_pax_msg, (char *)&p); |
| 8459 |
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|
3 | xdr_free((xdrproc_t)xdr_app_data, (char *)&a); |
| 8460 | |||
| 8461 | 3 | return result; | |
| 8462 | } | ||
| 8463 | |||
| 8464 | #ifdef NOTDEF | ||
| 8465 | /* Not completely implemented, need to be handled properly | ||
| 8466 | when received as a client message in dispatch_op. | ||
| 8467 | Should have separate opcode from normal add/remove, | ||
| 8468 | like force config_type */ | ||
| 8469 | int xcom_client_force_add_node(connection_descriptor *fd, node_list *nl, | ||
| 8470 | uint32_t group_id) { | ||
| 8471 | if (!fd) return 0; | ||
| 8472 | return xcom_send_cfg_wait(fd, nl, group_id, add_node_type, 1); | ||
| 8473 | } | ||
| 8474 | |||
| 8475 | int xcom_client_force_remove_node(connection_descriptor *fd, node_list *nl, | ||
| 8476 | uint32_t group_id) { | ||
| 8477 | if (!fd) return 0; | ||
| 8478 | return xcom_send_cfg_wait(fd, nl, group_id, remove_node_type, 1); | ||
| 8479 | } | ||
| 8480 | #endif | ||
| 8481 | |||
| 8482 | /* purecov: begin deadcode */ | ||
| 8483 | ✗ | int xcom_client_enable_arbitrator(connection_descriptor *fd) { | |
| 8484 | ✗ | if (!fd) return 0; | |
| 8485 | app_data a; | ||
| 8486 | ✗ | int retval = 0; | |
| 8487 | ✗ | init_app_data(&a); | |
| 8488 | ✗ | a.body.c_t = enable_arbitrator; | |
| 8489 | ✗ | retval = xcom_send_app_wait(fd, &a, 0, nullptr); | |
| 8490 | ✗ | xdr_free((xdrproc_t)xdr_app_data, (char *)&a); | |
| 8491 | ✗ | return retval; | |
| 8492 | } | ||
| 8493 | /* purecov: end */ | ||
| 8494 | |||
| 8495 | /* purecov: begin deadcode */ | ||
| 8496 | ✗ | int xcom_client_disable_arbitrator(connection_descriptor *fd) { | |
| 8497 | ✗ | if (!fd) return 0; | |
| 8498 | app_data a; | ||
| 8499 | ✗ | int retval = 0; | |
| 8500 | ✗ | init_app_data(&a); | |
| 8501 | ✗ | a.body.c_t = disable_arbitrator; | |
| 8502 | ✗ | retval = xcom_send_app_wait(fd, &a, 0, nullptr); | |
| 8503 | ✗ | xdr_free((xdrproc_t)xdr_app_data, (char *)&a); | |
| 8504 | ✗ | return retval; | |
| 8505 | } | ||
| 8506 | /* purecov: end */ | ||
| 8507 | |||
| 8508 | /* purecov: begin deadcode */ | ||
| 8509 | ✗ | int xcom_client_set_cache_limit(connection_descriptor *fd, | |
| 8510 | uint64_t cache_limit) { | ||
| 8511 | ✗ | if (!fd) return 0; | |
| 8512 | app_data a; | ||
| 8513 | ✗ | int retval = 0; | |
| 8514 | ✗ | init_app_data(&a); | |
| 8515 | ✗ | a.body.c_t = set_cache_limit; | |
| 8516 | ✗ | a.body.app_u_u.cache_limit = cache_limit; | |
| 8517 | ✗ | retval = xcom_send_app_wait(fd, &a, 0, nullptr); | |
| 8518 | ✗ | xdr_free((xdrproc_t)xdr_app_data, (char *)&a); | |
| 8519 | ✗ | return retval; | |
| 8520 | } | ||
| 8521 | /* purecov: end */ | ||
| 8522 | |||
| 8523 | ✗ | int xcom_client_convert_into_local_server(connection_descriptor *const fd) { | |
| 8524 | ✗ | if (!fd) return 0; | |
| 8525 | app_data a; | ||
| 8526 | ✗ | int retval = 0; | |
| 8527 | ✗ | retval = xcom_send_app_wait(fd, init_convert_into_local_server_msg(&a), 0, | |
| 8528 | nullptr); | ||
| 8529 | ✗ | xdr_free((xdrproc_t)xdr_app_data, (char *)&a); | |
| 8530 | ✗ | return retval; | |
| 8531 | } | ||
| 8532 | |||
| 8533 | /* Set max number of leaders */ | ||
| 8534 | 93 | void init_set_max_leaders(uint32_t group_id, app_data *a, node_no max_leaders) { | |
| 8535 | 93 | init_app_data(a); | |
| 8536 | 93 | a->app_key.group_id = a->group_id = group_id; | |
| 8537 | 93 | a->body.c_t = set_max_leaders; | |
| 8538 | 93 | a->body.app_u_u.max_leaders = max_leaders; | |
| 8539 | 93 | } | |
| 8540 | |||
| 8541 | /* Set max number of leaders */ | ||
| 8542 | 12 | int xcom_client_set_max_leaders(connection_descriptor *fd, node_no max_leaders, | |
| 8543 | uint32_t group_id) { | ||
| 8544 |
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|
12 | if (!fd) return 0; |
| 8545 | app_data a; | ||
| 8546 | ✗ | int retval = 0; | |
| 8547 | ✗ | init_set_max_leaders(group_id, &a, max_leaders); | |
| 8548 | ✗ | retval = xcom_send_app_wait(fd, &a, 0, nullptr); | |
| 8549 | ✗ | xdr_free((xdrproc_t)xdr_app_data, (char *)&a); | |
| 8550 | ✗ | return retval; | |
| 8551 | } | ||
| 8552 | |||
| 8553 | 87 | leader_array new_leader_array(u_int n, char const *names[]) { | |
| 8554 |
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|
87 | leader_array leaders = alloc_leader_array(n); |
| 8555 |
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|
166 | for (u_int i = 0; i < n; i++) { |
| 8556 | 79 | leaders.leader_array_val[i].address = strdup(names[i]); | |
| 8557 | } | ||
| 8558 | 87 | return leaders; | |
| 8559 | } | ||
| 8560 | |||
| 8561 | /* Set new set of active leaders. Does not deallocate leaders. */ | ||
| 8562 | 87 | void init_set_leaders(uint32_t group_id, app_data *a, | |
| 8563 | leader_array const leaders) { | ||
| 8564 | 87 | init_app_data(a); | |
| 8565 | 87 | a->app_key.group_id = a->group_id = group_id; | |
| 8566 | 87 | a->body.c_t = set_leaders_type; | |
| 8567 | // We could have avoided this copy, but having leaders as const | ||
| 8568 | // makes it easier to reason about sharing | ||
| 8569 | 87 | a->body.app_u_u.leaders = clone_leader_array(leaders); | |
| 8570 | 87 | } | |
| 8571 | |||
| 8572 | /* Set new set of active leaders. */ | ||
| 8573 | 12 | void init_set_leaders(uint32_t group_id, app_data *a, u_int n, | |
| 8574 | char const *names[]) { | ||
| 8575 |
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|
12 | leader_array leaders = new_leader_array(n, names); |
| 8576 |
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|
12 | init_set_leaders(group_id, a, leaders); |
| 8577 | // leaders have been copied, so deallocate | ||
| 8578 |
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|
12 | xdr_free((xdrproc_t)xdr_leader_array, (char *)(&leaders)); |
| 8579 | 12 | } | |
| 8580 | |||
| 8581 | 75 | void init_set_leaders(uint32_t group_id, app_data *leader_app, | |
| 8582 | leader_array const leaders, app_data *max_app, | ||
| 8583 | node_no max_leaders) { | ||
| 8584 | 75 | init_set_leaders(group_id, leader_app, leaders); | |
| 8585 | 75 | init_set_max_leaders(group_id, max_app, max_leaders); | |
| 8586 | 75 | leader_app->next = max_app; | |
| 8587 | 75 | } | |
| 8588 | |||
| 8589 | 75 | void init_set_leaders(uint32_t group_id, app_data *leader_app, u_int n, | |
| 8590 | char const *names[], app_data *max_app, | ||
| 8591 | node_no max_leaders) { | ||
| 8592 |
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|
75 | leader_array leaders = new_leader_array(n, names); |
| 8593 |
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|
75 | init_set_leaders(group_id, leader_app, leaders, max_app, max_leaders); |
| 8594 | // leaders have been copied, so deallocate | ||
| 8595 |
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|
75 | xdr_free((xdrproc_t)xdr_leader_array, (char *)(&leaders)); |
| 8596 | 75 | } | |
| 8597 | |||
| 8598 | /* Set new set of active leaders. */ | ||
| 8599 | 15 | int xcom_client_set_leaders(connection_descriptor *fd, u_int n, | |
| 8600 | char const *names[], uint32_t group_id) { | ||
| 8601 |
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|
15 | if (!fd) return 0; |
| 8602 | app_data a; | ||
| 8603 | ✗ | init_set_leaders(group_id, &a, n, names); | |
| 8604 | ✗ | int retval = xcom_send_app_wait(fd, &a, 0, nullptr); | |
| 8605 | ✗ | xdr_free((xdrproc_t)xdr_app_data, (char *)&a); | |
| 8606 | ✗ | return retval; | |
| 8607 | } | ||
| 8608 | |||
| 8609 | std::unique_ptr<Network_provider_management_interface> | ||
| 8610 | 58393 | get_network_management_interface() { | |
| 8611 | 58393 | return std::make_unique<Network_Management_Interface>(); | |
| 8612 | } | ||
| 8613 | |||
| 8614 | std::unique_ptr<Network_provider_operations_interface> | ||
| 8615 | 2365 | get_network_operations_interface() { | |
| 8616 | 2365 | return std::make_unique<Network_Management_Interface>(); | |
| 8617 | } | ||
| 8618 | |||
| 8619 | /* Set new set of active leaders and number of leaders. */ | ||
| 8620 | ✗ | int xcom_client_set_leaders(connection_descriptor *fd, u_int n, | |
| 8621 | char const *names[], node_no max_leaders, | ||
| 8622 | uint32_t group_id) { | ||
| 8623 | ✗ | if (!fd) return 0; | |
| 8624 | app_data leader_app; | ||
| 8625 | app_data max_app; | ||
| 8626 | ✗ | int retval = 0; | |
| 8627 | ✗ | init_set_leaders(group_id, &leader_app, n, names, &max_app, max_leaders); | |
| 8628 | ✗ | retval = xcom_send_app_wait(fd, &leader_app, 0, nullptr); | |
| 8629 | // leader_app and max_app have been linked, so unlink | ||
| 8630 | // to avoid deallocating the stack objects. | ||
| 8631 | ✗ | leader_app.next = nullptr; | |
| 8632 | ✗ | max_app.next = nullptr; | |
| 8633 | ✗ | xdr_free((xdrproc_t)xdr_app_data, (char *)&leader_app); | |
| 8634 | ✗ | xdr_free((xdrproc_t)xdr_app_data, (char *)&max_app); | |
| 8635 | ✗ | return retval; | |
| 8636 | } | ||
| 8637 | |||
| 8638 | ✗ | int xcom_client_get_leaders(connection_descriptor *fd, uint32_t group_id, | |
| 8639 | leader_info_data *leaders) { | ||
| 8640 | ✗ | if (!fd) return 0; | |
| 8641 | pax_msg p; | ||
| 8642 | app_data a; | ||
| 8643 | ✗ | int result = 0; | |
| 8644 | |||
| 8645 | ✗ | memset(&p, 0, sizeof(p)); | |
| 8646 | |||
| 8647 | ✗ | xcom_send_app_wait_result res = xcom_send_app_wait_and_get( | |
| 8648 | fd, init_get_msg(&a, group_id, get_leaders_type), 0, &p, nullptr); | ||
| 8649 | ✗ | result = xcom_check_reply(res); | |
| 8650 | ✗ | if (result) { | |
| 8651 | // Steal the returned data | ||
| 8652 | ✗ | *leaders = steal_leader_info_data(p.rd->reply_data_u.leaders); | |
| 8653 | } | ||
| 8654 | |||
| 8655 | ✗ | xdr_free((xdrproc_t)xdr_pax_msg, (char *)&p); | |
| 8656 | ✗ | xdr_free((xdrproc_t)xdr_app_data, (char *)&a); | |
| 8657 | |||
| 8658 | ✗ | return result; | |
| 8659 | } | ||
| 8660 | |||
| 8661 | #if 0 | ||
| 8662 | /* Called when leader changes */ | ||
| 8663 | static xcom_election_cb election_cb [[maybe_unused]] = NULL; | ||
| 8664 | |||
| 8665 | void set_xcom_election_cb(xcom_election_cb x) { election_cb = x; } | ||
| 8666 | #endif | ||
| 8667 | |||
| 8668 | // The timer code and the associated Paxos FSM stuff is only used for | ||
| 8669 | // tracking/debugging Paxos state transitions at the moment, but I believe the | ||
| 8670 | // FSM is correct, and if used for actually handling the incoming messages, | ||
| 8671 | // would make the code simpler, and easier to understand and reason about by | ||
| 8672 | // making lots of tests scattered around in the code unnecessary. I have had | ||
| 8673 | // this on the backburner for a long time, and used the single writer worklog | ||
| 8674 | // to test it, but did not dare to actually replace the existing logic in the | ||
| 8675 | // scope of this worklog.Take it as a hint for future improvement of the code | ||
| 8676 | // base... | ||
| 8677 | |||
| 8678 | // The time queue as configured now will allow up to 10 seconds delay with | ||
| 8679 | // TICK_PERIOD (0.01) seconds granularity. All machines which map to the same | ||
| 8680 | // time slot will wake up simultaneously. The complexity when inserting or | ||
| 8681 | // removing a pax_machine is O(1), but this is somewhat offset by the need to | ||
| 8682 | // advance the current tick for every TICK_PERIOD. Not a problem in practice, | ||
| 8683 | // and the code is dead simple. | ||
| 8684 | |||
| 8685 | /* Max number of ticks before wrapping. With 10 ms per step, this will give a | ||
| 8686 | * max delay of 10 seconds, which is plenty for the Paxos timers */ | ||
| 8687 | |||
| 8688 | enum { paxos_timer_range = 1000 }; | ||
| 8689 | /* Ten milliseconds granularity is sufficient */ | ||
| 8690 | #define TICK_PERIOD 0.01 | ||
| 8691 | |||
| 8692 | /* The index into the time queue */ | ||
| 8693 | static unsigned int current_tick = 0; | ||
| 8694 | |||
| 8695 | /* The time queue is an array of timers. Each timer is the head of | ||
| 8696 | a possibly empty list of timers */ | ||
| 8697 | |||
| 8698 | static linkage time_queue[paxos_timer_range]; | ||
| 8699 | |||
| 8700 | 2355 | static void init_time_queue() { | |
| 8701 | unsigned int i; | ||
| 8702 |
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|
2357355 | for (i = 0; i < paxos_timer_range; i++) { |
| 8703 | 2355000 | link_init(&time_queue[i], TYPE_HASH("time_queue")); | |
| 8704 | } | ||
| 8705 | 2355 | } | |
| 8706 | |||
| 8707 | /* Put pax_machine into the time queue at the correct place */ | ||
| 8708 | 261128 | static void paxos_twait(pax_machine *p, unsigned int t) { | |
| 8709 | /* Guard aginst 0 delay, which would become max delay */ | ||
| 8710 |
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|
261128 | if (0 == t) t = 1; |
| 8711 | 261128 | unsigned int pos = (current_tick + t) % paxos_timer_range; | |
| 8712 | 261128 | link_into(&p->watchdog, &time_queue[pos]); | |
| 8713 |
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|
261128 | assert(!link_empty(&time_queue[pos])); |
| 8714 | 261128 | } | |
| 8715 | |||
| 8716 | /* Remove pax_machine from timer queue */ | ||
| 8717 | 599444 | static void paxos_twait_cancel(pax_machine *p) { link_out(&p->watchdog); } | |
| 8718 | |||
| 8719 | /* Wake all pax_machines waiting at time slot t */ | ||
| 8720 | 8326948 | static void paxos_wakeup(unsigned int t) { | |
| 8721 | 8326948 | linkage *head = &time_queue[t]; | |
| 8722 | linkage *p; | ||
| 8723 | 8326948 | if (!link_empty(head)) { | |
| 8724 | IFDBG(D_CONS, FN; NUMEXP(t); NUMEXP(link_empty(head))); | ||
| 8725 | } | ||
| 8726 |
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|
8330708 | while (!link_empty(head)) { |
| 8727 | 3760 | p = link_first(head); | |
| 8728 | 3760 | paxos_timeout(container_of(p, pax_machine, watchdog)); | |
| 8729 | 3760 | link_out(p); | |
| 8730 | } | ||
| 8731 | 8326948 | } | |
| 8732 | |||
| 8733 | /* Advance current_tick to next slot and wake all pax_machines there */ | ||
| 8734 | 8326948 | static void paxos_timer_advance() { | |
| 8735 | 8326948 | current_tick = (current_tick + 1) % paxos_timer_range; | |
| 8736 | 8326948 | paxos_wakeup(current_tick); | |
| 8737 | 8326948 | } | |
| 8738 | |||
| 8739 | /* Fire any expired timer for a Paxos machine */ | ||
| 8740 | 8331644 | static int paxos_timer_task(task_arg arg [[maybe_unused]]) { | |
| 8741 | DECL_ENV | ||
| 8742 | double start; | ||
| 8743 | 2355 | ENV_INIT | |
| 8744 | 2355 | END_ENV_INIT | |
| 8745 | END_ENV; | ||
| 8746 |
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|
8331644 | TASK_BEGIN |
| 8747 | 2348 | ep->start = task_now(); | |
| 8748 |
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|
8329296 | while (!xcom_shutdown) { |
| 8749 | 8329296 | ep->start += TICK_PERIOD; | |
| 8750 |
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|
16658585 | TASK_DELAY_UNTIL(ep->start); |
| 8751 | 8326948 | paxos_timer_advance(); | |
| 8752 | } | ||
| 8753 | ✗ | FINALLY | |
| 8754 | IFDBG(D_CONS, FN; STRLIT(" shutdown ")); | ||
| 8755 |
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|
2348 | TASK_END; |
| 8756 | } | ||
| 8757 | |||
| 8758 | /* The state functions/thunks */ | ||
| 8759 | static int paxos_fsm_p1_master_enter(pax_machine *paxos, site_def const *site, | ||
| 8760 | paxos_event event, pax_msg *mess); | ||
| 8761 | |||
| 8762 | static int paxos_fsm_p1_master_wait(pax_machine *paxos, site_def const *site, | ||
| 8763 | paxos_event event, pax_msg *mess); | ||
| 8764 | |||
| 8765 | static int paxos_fsm_p2_master_enter(pax_machine *paxos, site_def const *site, | ||
| 8766 | paxos_event event, pax_msg *mess); | ||
| 8767 | |||
| 8768 | static int paxos_fsm_p2_master_wait(pax_machine *paxos, site_def const *site, | ||
| 8769 | paxos_event event, pax_msg *mess); | ||
| 8770 | |||
| 8771 | static int paxos_fsm_p2_slave_enter(pax_machine *paxos, site_def const *site, | ||
| 8772 | paxos_event event, pax_msg *mess); | ||
| 8773 | |||
| 8774 | static int paxos_fsm_p2_slave_wait(pax_machine *paxos, site_def const *site, | ||
| 8775 | paxos_event event, pax_msg *mess); | ||
| 8776 | |||
| 8777 | static int paxos_fsm_p3_master_wait(pax_machine *paxos, site_def const *site, | ||
| 8778 | paxos_event event, pax_msg *mess); | ||
| 8779 | |||
| 8780 | static int paxos_fsm_p3_slave_enter(pax_machine *paxos, site_def const *site, | ||
| 8781 | paxos_event event, pax_msg *mess); | ||
| 8782 | |||
| 8783 | static int paxos_fsm_p3_slave_wait(pax_machine *paxos, site_def const *site, | ||
| 8784 | paxos_event event, pax_msg *mess); | ||
| 8785 | |||
| 8786 | static int paxos_fsm_finished(pax_machine *paxos, site_def const *site, | ||
| 8787 | paxos_event event, pax_msg *mess); | ||
| 8788 | |||
| 8789 | typedef void (*paxos_state_action)(pax_machine *paxos, site_def const *site, | ||
| 8790 | pax_msg *mess); | ||
| 8791 | |||
| 8792 | 8912 | static int accept_new_prepare(pax_machine *paxos, pax_msg *mess) { | |
| 8793 |
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|
17824 | return noop_match(paxos, mess) || |
| 8794 |
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|
17824 | gt_ballot(mess->proposal, paxos->acceptor.promise); |
| 8795 | } | ||
| 8796 | |||
| 8797 | 10975 | static int accept_new_accept(pax_machine *paxos, pax_msg *mess) { | |
| 8798 |
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|
21747 | return noop_match(paxos, mess) || |
| 8799 |
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|
21747 | !gt_ballot(paxos->acceptor.promise, mess->proposal); |
| 8800 | } | ||
| 8801 | |||
| 8802 | 261128 | static int own_message(pax_msg *mess, site_def const *site) { | |
| 8803 | 261128 | return is_local_node(mess->from, site); | |
| 8804 | } | ||
| 8805 | |||
| 8806 | // Default paxos timeout in ticks | ||
| 8807 | // Change this if the FSM is used for anything else than debugging | ||
| 8808 | unsigned int constexpr const paxos_default_timeout = 100; | ||
| 8809 | |||
| 8810 | /* You are in a maze of little twisting functions ... */ | ||
| 8811 | |||
| 8812 | 27437 | static void action_paxos_prepare(pax_machine *paxos, site_def const *site, | |
| 8813 | pax_msg *mess) { | ||
| 8814 |
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|
27437 | if (own_message(mess, site)) { |
| 8815 | /* Wait for ack_prepare */ | ||
| 8816 | 16952 | SET_PAXOS_FSM_STATE(paxos, paxos_fsm_p1_master_wait); | |
| 8817 | } else { | ||
| 8818 | /* Wait for accept */ | ||
| 8819 | 10485 | SET_PAXOS_FSM_STATE(paxos, paxos_fsm_p2_slave_enter); | |
| 8820 | } | ||
| 8821 | 27437 | paxos_twait(paxos, paxos_default_timeout); | |
| 8822 | 27437 | } | |
| 8823 | |||
| 8824 | 213828 | static void action_paxos_accept(pax_machine *paxos, site_def const *site, | |
| 8825 | pax_msg *mess) { | ||
| 8826 |
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|
213828 | if (own_message(mess, site)) { |
| 8827 | /* Wait for ack_accept */ | ||
| 8828 | 108513 | SET_PAXOS_FSM_STATE(paxos, paxos_fsm_p2_master_wait); | |
| 8829 | } else { | ||
| 8830 | /* Wait for learn */ | ||
| 8831 | 105315 | SET_PAXOS_FSM_STATE(paxos, paxos_fsm_p3_slave_enter); | |
| 8832 | } | ||
| 8833 | 213828 | paxos_twait(paxos, paxos_default_timeout); | |
| 8834 | 213828 | } | |
| 8835 | |||
| 8836 | 599444 | static void action_paxos_learn(pax_machine *paxos, site_def const *site, | |
| 8837 | pax_msg *mess) { | ||
| 8838 | (void)site; | ||
| 8839 | (void)mess; | ||
| 8840 | /* We are finished */ | ||
| 8841 | 599444 | SET_PAXOS_FSM_STATE(paxos, paxos_fsm_finished); | |
| 8842 | 599444 | paxos_twait_cancel(paxos); | |
| 8843 | 599444 | } | |
| 8844 | |||
| 8845 | ✗ | static void action_paxos_start(pax_machine *paxos, site_def const *site, | |
| 8846 | pax_msg *mess) { | ||
| 8847 | (void)site; | ||
| 8848 | (void)mess; | ||
| 8849 | /* Find value of this instance */ | ||
| 8850 | ✗ | SET_PAXOS_FSM_STATE(paxos, paxos_fsm_p1_master_enter); | |
| 8851 | ✗ | paxos_twait(paxos, paxos_default_timeout); | |
| 8852 | } | ||
| 8853 | |||
| 8854 | 8912 | static void action_new_prepare(pax_machine *paxos, site_def const *site, | |
| 8855 | pax_msg *mess) { | ||
| 8856 | (void)site; | ||
| 8857 |
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|
8912 | if (accept_new_prepare(paxos, mess)) { |
| 8858 | /* Wait for accept */ | ||
| 8859 |
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|
8888 | if (own_message(mess, site)) { |
| 8860 | /* Wait for ack_prepare */ | ||
| 8861 | 8420 | SET_PAXOS_FSM_STATE(paxos, paxos_fsm_p1_master_enter); | |
| 8862 | } else { | ||
| 8863 | /* Wait for accept */ | ||
| 8864 | 468 | SET_PAXOS_FSM_STATE(paxos, paxos_fsm_p2_slave_enter); | |
| 8865 | } | ||
| 8866 | 8888 | paxos_twait(paxos, paxos_default_timeout); | |
| 8867 | } | ||
| 8868 | 8912 | } | |
| 8869 | |||
| 8870 | 26602 | static void action_ack_prepare(pax_machine *paxos, site_def const *site, | |
| 8871 | pax_msg *mess) { | ||
| 8872 | (void)mess; | ||
| 8873 |
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|
26602 | if (check_propose(site, paxos)) { |
| 8874 | /* Wait for accept */ | ||
| 8875 | 10232 | SET_PAXOS_FSM_STATE(paxos, paxos_fsm_p2_master_enter); | |
| 8876 | } | ||
| 8877 | 26602 | } | |
| 8878 | |||
| 8879 | 10975 | static void action_new_accept(pax_machine *paxos, site_def const *site, | |
| 8880 | pax_msg *mess) { | ||
| 8881 |
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|
10975 | if (accept_new_accept(paxos, mess)) { |
| 8882 | /* Wait for accept */ | ||
| 8883 |
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|
10975 | if (own_message(mess, site)) { |
| 8884 | /* Wait for ack_accept */ | ||
| 8885 | 543 | SET_PAXOS_FSM_STATE(paxos, paxos_fsm_p2_master_enter); | |
| 8886 | } else { | ||
| 8887 | /* Wait for learn */ | ||
| 8888 | 10432 | SET_PAXOS_FSM_STATE(paxos, paxos_fsm_p3_slave_enter); | |
| 8889 | } | ||
| 8890 | 10975 | paxos_twait(paxos, paxos_default_timeout); | |
| 8891 | } | ||
| 8892 | 10975 | } | |
| 8893 | |||
| 8894 | 211845 | static void action_ack_accept(pax_machine *paxos, site_def const *site, | |
| 8895 | pax_msg *mess) { | ||
| 8896 | (void)mess; | ||
| 8897 |
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|
211845 | if (learn_ok(site, paxos)) { |
| 8898 | /* Wait for learn message */ | ||
| 8899 | 118014 | SET_PAXOS_FSM_STATE(paxos, paxos_fsm_p3_master_wait); | |
| 8900 | } | ||
| 8901 | 211845 | } | |
| 8902 | |||
| 8903 | 7300 | static void action_ignorant(pax_machine *paxos, site_def const *site, | |
| 8904 | pax_msg *mess) { | ||
| 8905 | (void)paxos; | ||
| 8906 | (void)site; | ||
| 8907 | (void)mess; | ||
| 8908 | 7300 | } | |
| 8909 | |||
| 8910 | /* Dispatch tables for each state */ | ||
| 8911 | paxos_state_action p1_idle_vtbl[last_p_event] = {action_paxos_prepare, | ||
| 8912 | nullptr, | ||
| 8913 | action_paxos_accept, | ||
| 8914 | nullptr, | ||
| 8915 | action_paxos_learn, | ||
| 8916 | action_paxos_start, | ||
| 8917 | nullptr}; | ||
| 8918 | paxos_state_action p1_master_enter_vtbl[last_p_event] = {action_new_prepare, | ||
| 8919 | action_ack_prepare, | ||
| 8920 | action_new_accept, | ||
| 8921 | nullptr, | ||
| 8922 | action_paxos_learn, | ||
| 8923 | nullptr, | ||
| 8924 | nullptr}; | ||
| 8925 | paxos_state_action p1_master_wait_vtbl[last_p_event] = {action_new_prepare, | ||
| 8926 | action_ack_prepare, | ||
| 8927 | action_new_accept, | ||
| 8928 | nullptr, | ||
| 8929 | action_paxos_learn, | ||
| 8930 | nullptr, | ||
| 8931 | nullptr}; | ||
| 8932 | paxos_state_action p2_master_enter_vtbl[last_p_event] = {action_new_accept, | ||
| 8933 | nullptr, | ||
| 8934 | action_new_accept, | ||
| 8935 | action_ack_accept, | ||
| 8936 | action_paxos_learn, | ||
| 8937 | nullptr, | ||
| 8938 | nullptr}; | ||
| 8939 | paxos_state_action p2_master_wait_vtbl[last_p_event] = {action_new_prepare, | ||
| 8940 | nullptr, | ||
| 8941 | action_new_accept, | ||
| 8942 | action_ack_accept, | ||
| 8943 | action_paxos_learn, | ||
| 8944 | nullptr, | ||
| 8945 | nullptr}; | ||
| 8946 | paxos_state_action p2_slave_wait_vtbl[last_p_event] = {action_new_prepare, | ||
| 8947 | nullptr, | ||
| 8948 | action_new_accept, | ||
| 8949 | nullptr, | ||
| 8950 | action_paxos_learn, | ||
| 8951 | nullptr, | ||
| 8952 | nullptr}; | ||
| 8953 | paxos_state_action p3_master_wait_vtbl[last_p_event] = {action_new_prepare, | ||
| 8954 | nullptr, | ||
| 8955 | action_new_accept, | ||
| 8956 | nullptr, | ||
| 8957 | action_paxos_learn, | ||
| 8958 | nullptr, | ||
| 8959 | nullptr}; | ||
| 8960 | paxos_state_action p3_slave_wait_vtbl[last_p_event] = {action_new_prepare, | ||
| 8961 | nullptr, | ||
| 8962 | action_new_accept, | ||
| 8963 | nullptr, | ||
| 8964 | action_paxos_learn, | ||
| 8965 | nullptr, | ||
| 8966 | nullptr}; | ||
| 8967 | paxos_state_action p_finished_vtbl[last_p_event] = { | ||
| 8968 | action_ignorant, nullptr, action_ignorant, nullptr, | ||
| 8969 | nullptr, nullptr, nullptr}; | ||
| 8970 | |||
| 8971 | 1284480 | static inline void dispatch_p_event(paxos_state_action *vtbl, | |
| 8972 | pax_machine *paxos, site_def const *site, | ||
| 8973 | paxos_event event, pax_msg *mess) { | ||
| 8974 |
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|
1284480 | if (vtbl[event]) { |
| 8975 | 1106343 | vtbl[event](paxos, site, mess); | |
| 8976 | } | ||
| 8977 | 1284480 | } | |
| 8978 | |||
| 8979 | /* init state */ | ||
| 8980 | 599655 | int paxos_fsm_idle(pax_machine *paxos, site_def const *site, paxos_event event, | |
| 8981 | pax_msg *mess) { | ||
| 8982 | IFDBG(D_CONS, FN;); | ||
| 8983 | 599655 | dispatch_p_event(p1_idle_vtbl, paxos, site, event, mess); | |
| 8984 | 599655 | return 0; | |
| 8985 | } | ||
| 8986 | |||
| 8987 | /* Phase 1 master enter */ | ||
| 8988 | 8420 | static int paxos_fsm_p1_master_enter(pax_machine *paxos, site_def const *site, | |
| 8989 | paxos_event event, pax_msg *mess) { | ||
| 8990 | (void)site; | ||
| 8991 | (void)event; | ||
| 8992 | (void)mess; | ||
| 8993 | IFDBG(D_CONS, FN;); | ||
| 8994 | /* Send prepare and start timer */ | ||
| 8995 | 8420 | SET_PAXOS_FSM_STATE(paxos, paxos_fsm_p1_master_wait); | |
| 8996 | 8420 | return 0; | |
| 8997 | } | ||
| 8998 | |||
| 8999 | /* Phase 1 master wait */ | ||
| 9000 | 41580 | static int paxos_fsm_p1_master_wait(pax_machine *paxos, site_def const *site, | |
| 9001 | paxos_event event, pax_msg *mess) { | ||
| 9002 | IFDBG(D_CONS, FN;); | ||
| 9003 | 41580 | dispatch_p_event(p1_master_wait_vtbl, paxos, site, event, mess); | |
| 9004 | 41580 | return 0; | |
| 9005 | } | ||
| 9006 | |||
| 9007 | /* Phase 2 master enter */ | ||
| 9008 | 10775 | static int paxos_fsm_p2_master_enter(pax_machine *paxos, site_def const *site, | |
| 9009 | paxos_event event, pax_msg *mess) { | ||
| 9010 | (void)site; | ||
| 9011 | (void)event; | ||
| 9012 | (void)mess; | ||
| 9013 | IFDBG(D_CONS, FN;); | ||
| 9014 | /* Send prepare and start timer */ | ||
| 9015 | 10775 | SET_PAXOS_FSM_STATE(paxos, paxos_fsm_p2_master_wait); | |
| 9016 | 10775 | return 0; | |
| 9017 | } | ||
| 9018 | |||
| 9019 | /* Phase 2 master wait */ | ||
| 9020 | 213163 | static int paxos_fsm_p2_master_wait(pax_machine *paxos, site_def const *site, | |
| 9021 | paxos_event event, pax_msg *mess) { | ||
| 9022 | IFDBG(D_CONS, FN;); | ||
| 9023 | 213163 | dispatch_p_event(p2_master_wait_vtbl, paxos, site, event, mess); | |
| 9024 | 213163 | return 0; | |
| 9025 | } | ||
| 9026 | |||
| 9027 | /* Phase 2 slave enter */ | ||
| 9028 | 10943 | static int paxos_fsm_p2_slave_enter(pax_machine *paxos, site_def const *site, | |
| 9029 | paxos_event event, pax_msg *mess) { | ||
| 9030 | (void)site; | ||
| 9031 | (void)event; | ||
| 9032 | (void)mess; | ||
| 9033 | IFDBG(D_CONS, FN;); | ||
| 9034 | /* Start timer */ | ||
| 9035 | 10943 | SET_PAXOS_FSM_STATE(paxos, paxos_fsm_p2_slave_wait); | |
| 9036 | 10943 | return 1; | |
| 9037 | } | ||
| 9038 | |||
| 9039 | /* Phase 2 slave wait */ | ||
| 9040 | 10943 | static int paxos_fsm_p2_slave_wait(pax_machine *paxos, site_def const *site, | |
| 9041 | paxos_event event, pax_msg *mess) { | ||
| 9042 | IFDBG(D_CONS, FN;); | ||
| 9043 | 10943 | dispatch_p_event(p2_slave_wait_vtbl, paxos, site, event, mess); | |
| 9044 | 10943 | return 0; | |
| 9045 | } | ||
| 9046 | |||
| 9047 | /* Phase 3 master wait */ | ||
| 9048 | 130508 | static int paxos_fsm_p3_master_wait(pax_machine *paxos, site_def const *site, | |
| 9049 | paxos_event event, pax_msg *mess) { | ||
| 9050 | IFDBG(D_CONS, FN;); | ||
| 9051 | 130508 | dispatch_p_event(p3_master_wait_vtbl, paxos, site, event, mess); | |
| 9052 | 130508 | return 0; | |
| 9053 | } | ||
| 9054 | |||
| 9055 | /* Phase 3 slave enter */ | ||
| 9056 | 115747 | static int paxos_fsm_p3_slave_enter(pax_machine *paxos, site_def const *site, | |
| 9057 | paxos_event event, pax_msg *mess) { | ||
| 9058 | (void)site; | ||
| 9059 | (void)event; | ||
| 9060 | (void)mess; | ||
| 9061 | IFDBG(D_CONS, FN;); | ||
| 9062 | /* Start timer */ | ||
| 9063 | 115747 | SET_PAXOS_FSM_STATE(paxos, paxos_fsm_p3_slave_wait); | |
| 9064 | 115747 | return 1; | |
| 9065 | } | ||
| 9066 | |||
| 9067 | /* Phase 3 slave wait */ | ||
| 9068 | 115747 | static int paxos_fsm_p3_slave_wait(pax_machine *paxos, site_def const *site, | |
| 9069 | paxos_event event, pax_msg *mess) { | ||
| 9070 | IFDBG(D_CONS, FN;); | ||
| 9071 | 115747 | dispatch_p_event(p3_slave_wait_vtbl, paxos, site, event, mess); | |
| 9072 | 115747 | return 0; | |
| 9073 | } | ||
| 9074 | |||
| 9075 | /* Finished */ | ||
| 9076 | 172884 | static int paxos_fsm_finished(pax_machine *paxos, site_def const *site, | |
| 9077 | paxos_event event, pax_msg *mess) { | ||
| 9078 | IFDBG(D_CONS, FN;); | ||
| 9079 | 172884 | dispatch_p_event(p_finished_vtbl, paxos, site, event, mess); | |
| 9080 | 172884 | return 0; | |
| 9081 | } | ||
| 9082 | |||
| 9083 | #define X(b) #b | ||
| 9084 | const char *paxos_event_name[] = {p_events}; | ||
| 9085 | #undef X | ||
| 9086 | |||
| 9087 | /* Trampoline which loops calling thunks pointed to by paxos->state.state_fp | ||
| 9088 | * until 0 is returned. */ | ||
| 9089 | 1303675 | static void paxos_fsm(pax_machine *paxos, site_def const *site, | |
| 9090 | paxos_event event, pax_msg *mess) { | ||
| 9091 | /* Crank the state machine until it stops */ | ||
| 9092 | IFDBG(D_CONS, FN; PTREXP(paxos); SYCEXP(paxos->synode); | ||
| 9093 | BALCEXP(mess->proposal); STRLIT(paxos->state.state_name); STRLIT(" : "); | ||
| 9094 | STRLIT(paxos_event_name[event])); | ||
| 9095 |
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1430365 | while (paxos->state.state_fp(paxos, site, event, mess)) { |
| 9096 | IFDBG(D_CONS, FN; PTREXP(paxos); SYCEXP(paxos->synode); | ||
| 9097 | BALCEXP(mess->proposal); STRLIT(paxos->state.state_name); | ||
| 9098 | STRLIT(" : "); STRLIT(paxos_event_name[event])); | ||
| 9099 | } | ||
| 9100 | 1303675 | } | |
| 9101 |